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Home
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Hill's Prescription Diet
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z/d Hydrolysed Chicken Flavour Dry Dog Food

z/d Hydrolysed Chicken Flavour Dry Dog Food

Hill's Prescription Diet
4.3
(
409
)
Hill's Prescription Diet z/d Hydrolysed Chicken Flavour Dry Dog Food is a hypoallergenic dry diet formulated for dogs suffering from food allergies, adverse food reactions, or skin and gastrointestinal conditions driven by dietary intolerances. Food-related allergies in dogs can develop over time — even to proteins they have previously tolerated — and often manifest as itchy skin, recurrent ear infections, vomiting, or chronic loose stools. This formula uses hydrolysed chicken protein, broken down to a molecular level that bypasses the immune system's normal response, making it an effective option for highly sensitive dogs. Formulated by Hill's nutritionists and veterinarians, it delivers complete and balanced daily nutrition and is designed to be fed as a sole diet. It is commonly used for both diagnostic food trials and long-term allergy management. Always consult your veterinarian before starting this diet.
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Size 1
3.8kg
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Overview

Hill's Prescription Diet z/d Hydrolysed Chicken Flavour Dry Dog Food is a hypoallergenic dry diet formulated for dogs suffering from food allergies, adverse food reactions, or skin and gastrointestinal conditions driven by dietary intolerances. Food-related allergies in dogs can develop over time — even to proteins they have previously tolerated — and often manifest as itchy skin, recurrent ear infections, vomiting, or chronic loose stools. This formula uses hydrolysed chicken protein, broken down to a molecular level that bypasses the immune system's normal response, making it an effective option for highly sensitive dogs.

Formulated by Hill's nutritionists and veterinarians, it delivers complete and balanced daily nutrition and is designed to be fed as a sole diet. It is commonly used for both diagnostic food trials and long-term allergy management. Always consult your veterinarian before starting this diet.

Nutritional Analysis

Protein
20.1
%
0%
Fat
14.5
%
0%
Fibre
6.4
%
0%
Ash
2.54
%
0%
Carbohydrates
53.4
%
0%
Energy
350.5
0
 kcal/100g

Ingredients

Corn Starch, Hydrolyzed Chicken Liver, Hydrolyzed Chicken, Powdered Cellulose, Soybean Oil, Calcium Carbonate, Dicalcium Phosphate, Lactic Acid, Potassium Chloride, Glyceryl Monostearate, Choline Chloride, Iodized Salt, Vitamins (Vitamin E Supplement, Vitamin C, Vitamin B3, Vitamin B1, Vitamin A, Vitamin B5, Biotin, Vitamin B12, Vitamin B6, Vitamin B2, Folic Acid, Vitamin D3), DL-Methionine, Magnesium Oxide, Minerals (Iron, Zinc, Copper, Manganese, Iodine, Selenium), Taurine, Mixed Tocopherols, Natural Flavours, Beta-Carotene.

Ingredient images are illustrative only and may not represent the exact source or form used by manufacturers.
Fine white corn starch powder in a soft, fluffy mound on a plain background, highlighting its smooth texture
Corn Starch
Corn Starch
Maize Starch, Zea Mays Starch, E1401, Maizena
Summary
Corn starch is a fine, white powder derived from the endosperm of corn kernels, making it a plant-based ingredient. It is primarily used as a carbohydrate source and functional thickener in pet foods, aiding in texture and digestibility. Corn starch is utilised in its processed, refined form rather than as whole corn, ensuring consistency and optimal absorption in formulated diets.
Why it's used?
Corn starch is included as a cost-effective carbohydrate source and bulk-adding agent, helping to optimise product texture and binding. It also contributes to shelf stability by absorbing moisture and preventing spoilage.
Fine, light beige hydrolysed chicken liver powder with a slightly grainy texture, used in dog food and treats
Hydrolysed Chicken Liver
Hydrolysed Chicken Liver
Hydrolysed Poultry Liver, Hydrolysed Gallus Gallus Domesticus Liver, Hydrolysed Chicken Offal Liver, Hydrolysed Chicken Hepatic Extract
Summary
Hydrolysed chicken liver is an animal-derived ingredient produced by breaking down chicken liver proteins into smaller peptides through enzymatic hydrolysis. It is primarily included in pet food for its highly digestible protein content and palatability, supporting muscle maintenance and overall health. Unlike whole chicken liver, it is utilised in a hydrolysed form to reduce allergenic potential and enhance nutrient absorption.
Why it's used?
Hydrolysed chicken liver is included as a highly digestible protein source that enhances palatability and provides essential amino acids. Its hydrolysed form also reduces the risk of allergic reactions, making it suitable for sensitive or hypoallergenic pet food formulations.
Fine, light beige hydrolysed chicken powder with a slightly grainy texture, commonly used in sensitive dog food diets
Hydrolysed Chicken
Hydrolysed Chicken
Hydrolysed Poultry, Hydrolysed Gallus Gallus, Hydrolysed Chicken Protein, Hydrolysed Chicken Meat
Summary
Hydrolysed chicken is an animal-derived ingredient produced by breaking down chicken protein into smaller peptides through enzymatic hydrolysis. This process enhances digestibility and reduces the risk of allergic reactions in sensitive pets. Unlike whole chicken, hydrolysed chicken is utilised in its processed, peptide-rich form to optimise nutrient absorption and support hypoallergenic diets in premium pet foods.
Why it's used?
Hydrolysed chicken is included as a highly digestible protein source that minimises the risk of allergic reactions in sensitive pets. Its use also allows manufacturers to market the product as suitable for animals with food intolerances or allergies.
Light beige cellulose powder with a fine, soft texture, commonly used as dietary fibre in dog food
Cellulose Powder
Cellulose Powder
Microcrystalline Cellulose, Powdered Cellulose, E460, Cellulosum
Summary
Cellulose powder is a plant-derived ingredient sourced primarily from wood pulp. It serves as an insoluble dietary fibre, supporting digestive health and stool quality in pets. Rather than being used in its raw, fibrous state, cellulose is processed into a fine powder to optimise its functional benefits and ensure safe, consistent inclusion in pet food formulations.
Why it's used?
Cellulose powder is included as a cost-effective fibre source to aid stool quality and promote digestive health. It also functions as a bulk-adding agent, helping to control calorie density in pet food formulations.
Golden yellow drop of soybean oil with a smooth, glossy texture on a white background
Soybean Oil
Soybean Oil
Glycine Max Oil, E322, Soya Oil, Soya Bean Oil
Summary
Soybean oil is a plant-derived oil extracted from the seeds of the soybean (Glycine max). It serves as a concentrated source of energy and provides essential fatty acids, particularly linoleic acid, which supports skin and coat health in pets. Soybean oil is utilised in its refined liquid form, not as whole soybeans, to optimise digestibility and nutrient availability in pet food formulations.
Why it's used?
Soybean oil is included as a cost-effective source of fat and essential fatty acids, supporting energy density and skin and coat health in pet food. It also contributes to product texture and palatability while helping to optimise manufacturing costs.
Fine off-white calcium carbonate powder with a soft, smooth texture, commonly used in dog supplements
Calcium Carbonate
Calcium Carbonate
Chalk, Limestone, E170, Marble Dust
Summary
Calcium carbonate is a naturally occurring mineral compound derived from sources such as limestone or marine shells. It is primarily included in pet food as a source of calcium, essential for healthy bones, teeth, and metabolic functions. Calcium carbonate is not used in its raw mineral state; instead, it is processed into a purified, food-grade compound to optimise safety and bioavailability for pets.
Why it's used?
Calcium carbonate is included as a cost-effective mineral supplement to provide a bioavailable source of calcium, supporting bone health and proper nutritional balance. It also functions as a pH stabiliser, contributing to product consistency and shelf stability.
Fine off-white dicalcium phosphate powder with a slightly grainy texture, commonly used in dog supplements
Dicalcium Phosphate
Dicalcium Phosphate
Calcium Hydrogen Phosphate, Dibasic Calcium Phosphate, E341(ii), Calcium Phosphate Dibasic
Summary
Dicalcium phosphate is a mineral compound derived from calcium and phosphorus, commonly sourced from phosphate rock. It serves as a key dietary supplement in pet foods, providing essential calcium and phosphorus to support healthy bones and teeth. Dicalcium phosphate is not used in its natural raw or metallic state; instead, it is utilised in its purified compound form to ensure safety and optimal absorption.
Why it's used?
Dicalcium phosphate is included as a cost-effective mineral supplement to provide essential calcium and phosphorus for skeletal health. It also serves as a functional agent to improve product texture and processing stability.
Fine white lactic acid powder with a slightly grainy texture, displayed in a circular mound on a plain background
Lactic Acid
Lactic Acid
2-Hydroxypropanoic Acid, E270, DL-Lactic Acid, L(+)-Lactic Acid
Summary
Lactic acid is an organic compound of microbial origin, commonly produced through the fermentation of carbohydrates. It is primarily included in pet food as a preservative and acidifier, helping to inhibit the growth of harmful bacteria and maintain product freshness. Lactic acid is not used in its natural, raw state but is instead utilised in a purified, food-grade form to ensure safety and effective absorption.
Why it's used?
Lactic acid is included as a preservative to inhibit microbial growth and extend the product’s shelf life. It may also be used to enhance palatability by providing a mildly tangy flavour that appeals to pets.
Fine off-white powder form of potassium chloride, a common dietary supplement for dogs
Potassium Chloride
Potassium Chloride
E508, Muriate of Potash, Potassium Monochloride, KCl
Summary
Potassium chloride is a mineral compound derived from the element potassium, typically sourced from naturally occurring mineral deposits. It is utilised in pet food as a purified salt rather than in its raw metallic form, ensuring safety and optimal absorption. Its primary purpose is to provide essential potassium, which supports nerve function, muscle contraction, and fluid balance in companion animals.
Why it's used?
Potassium chloride is included as a cost-effective mineral supplement to help meet pets’ dietary potassium requirements. It also functions as a salt substitute to optimise electrolyte balance in the formulation.
Fine white powder texture of glycerol monostearate, a common dog food ingredient, shown in close-up detail
Glycerol Monostearate
Glycerol Monostearate
Monostearin, Glyceryl Stearate, E471, 1-Monostearoyl Glycerol
Summary
Glycerol monostearate is a compound derived from the esterification of glycerol (a plant or animal-based alcohol) and stearic acid (a fatty acid). It serves primarily as an emulsifier, helping to blend fats and water in pet food for improved texture and stability. Glycerol monostearate is not used in its natural raw form but is specifically utilised as a processed compound to optimise safety and functionality.
Why it's used?
Glycerol monostearate is included as an emulsifier to improve texture and maintain the stability of fats within the pet food, preventing separation during processing and storage. It may also contribute to extending shelf life by helping to retain moisture and inhibit staleness.
Fine, off-white choline chloride powder with a slightly grainy texture, commonly used in dog supplements
Choline Chloride
Choline Chloride
Trimethylethanolamine Chloride, Choline Monochloride, E1001, 2-Hydroxy-N,N,N-Trimethylethanaminium Chloride
Summary
Choline chloride is a synthetic compound derived from choline, an essential nutrient typically sourced from plant or animal origins. It is primarily included in pet food to support healthy brain function, liver metabolism, and cellular structure. Choline is not used in its natural state; instead, it is utilised as choline chloride to ensure stability, safety, and optimal absorption in pet diets.
Why it's used?
Choline chloride is included as an essential nutrient to support normal liver function and brain health in pets. It is a cost-effective way to meet regulatory requirements for choline content in complete and balanced pet foods.
Fine white iodised salt granules in a smooth, powdery pile on a plain background
Iodised Salt
Iodised Salt
Iodized Salt, Iodate Salt, Iodised Sodium Chloride, Iodised Table Salt
Summary
Iodised salt is a mineral-based ingredient produced by adding iodine, an essential trace element, to refined table salt. Sourced from mineral deposits, its primary purpose is to provide dietary sodium and ensure adequate iodine intake, supporting thyroid function and metabolic health. Iodised salt is not used in its natural raw form; instead, it is utilised as a fortified compound to optimise safety and bioavailability.
Why it's used?
Iodised salt is included as a cost-effective source of essential sodium and iodine, supporting pet health and meeting nutritional requirements. It also acts as a flavour enhancer to improve palatability.
Fine, pale yellow Vitamin E powder with a soft, slightly grainy texture, commonly used in dog supplements
Vitamin E
Vitamin E
Tocopherol, Alpha-Tocopherol, E307, D-Alpha-Tocopherol
Summary
Vitamin E is a fat-soluble vitamin derived from plant sources such as vegetable oils, nuts, and seeds. It functions primarily as an antioxidant, helping to protect cell membranes from oxidative damage and supporting immune health. In pet food, Vitamin E is not used in its natural raw form but is typically utilised as a stabilised compound, such as tocopherol acetate, to optimise safety and absorption.
Why it's used?
Vitamin E is included as a natural antioxidant to help preserve the freshness and stability of fats and oils in the product, thereby extending shelf life. It also serves as a label-friendly nutrient that appeals to consumers seeking added health benefits for their pets.
Fine white powder of vitamin C with a slightly grainy texture, commonly used as a dog supplement in Australia
Vitamin C
Vitamin C
Ascorbic Acid, L-Ascorbic Acid, E300, L-Threo-Hex-2-Enono-1,4-Lactone
Summary
Vitamin C, also known as ascorbic acid, is a water-soluble vitamin of plant origin commonly included in pet food formulations. Its primary purpose is to support immune function and act as an antioxidant, helping to protect cells from oxidative damage. Vitamin C is not used in its natural fruit form but is instead utilised as a synthesised compound to ensure stability and consistent dosage.
Why it's used?
Vitamin C is included as an antioxidant to help preserve the freshness and stability of the product by slowing oxidation. It may also be added for its perceived health benefits, supporting marketing claims related to immune support.
Fine white niacin powder with a slightly grainy texture, arranged in a circular mound on a plain background
Niacin
Niacin
Nicotinic Acid, Vitamin B3, Pyridine-3-Carboxylic Acid, E375
Summary
Niacin, also known as vitamin B3, is a water-soluble vitamin of synthetic or natural origin, commonly derived from plant or animal sources. It plays a crucial role in energy metabolism and supports healthy skin, nerves, and digestion in pets. Niacin is not used in its raw form but is typically included as a safe, bioavailable compound such as niacinamide or nicotinic acid.
Why it's used?
Niacin is included as an essential B vitamin to meet nutritional requirements and support metabolic health in pets. Its addition ensures compliance with regulatory standards for complete and balanced pet food labelling.
Fine white powder with a slightly grainy texture, thiamine mononitrate used in dog supplements on a plain background
Thiamine Mononitrate
Thiamine Mononitrate
Vitamin B1 Mononitrate, Nitrate Salt of Thiamine, E101a, Thiamin Mononitrate
Summary
Thiamine mononitrate is a synthetic, water-soluble form of vitamin B1, derived from chemical synthesis rather than natural sources. It is added to pet food to support energy metabolism and proper nervous system function. Thiamine is not used in its natural state; instead, the mononitrate compound is utilised for stability, safety, and optimal absorption in formulated diets.
Why it's used?
Thiamine mononitrate is included as a stable, cost-effective source of vitamin B1 to meet nutritional requirements and ensure product labelling compliance. Its synthetic form maintains potency during processing and storage, supporting both product stability and regulatory standards.
Fine pale yellow powder of Vitamin A with a smooth texture, commonly used as a dog supplement for health and nutrition
Vitamin A
Vitamin A
Retinol, Retinyl Palmitate, Retinyl Acetate, E160a
Summary
Vitamin A is an essential fat-soluble nutrient derived from animal sources (as retinyl esters) or plant sources (as carotenoids). It supports vision, immune function, and skin health in pets. In pet food, Vitamin A is not used in its raw or natural state but is provided as stabilised compounds (such as retinyl acetate or retinyl palmitate) to ensure safety, stability, and optimal absorption.
Why it's used?
Vitamin A is included as an essential nutrient to support vision, immune function, and overall health in pets, ensuring the product meets established nutritional standards. Its addition also allows manufacturers to optimise the nutritional profile and comply with regulatory labelling requirements.
Fine off-white powder texture of calcium pantothenate, a common supplement ingredient for dogs
Calcium Pantothenate
Calcium Pantothenate
D-Calcium Pantothenate, E315, Pantothenic Acid Calcium Salt, Calcium D-Pantothenate
Summary
Calcium pantothenate is a synthetic compound derived from pantothenic acid, a water-soluble B vitamin (vitamin B5) of plant or animal origin. It is primarily included in pet food to support energy metabolism and maintain healthy skin and coat. Rather than using pantothenic acid in its natural form, calcium pantothenate is utilised for its stability, safety, and enhanced bioavailability in pet nutrition.
Why it's used?
Calcium pantothenate is included as a stable, bioavailable source of vitamin B5 to meet nutritional requirements and support labelling claims of complete and balanced nutrition. Its use ensures consistent vitamin content throughout the product’s shelf life.
Fine off-white biotin powder with a slightly grainy texture, commonly used as a supplement for dogs
Biotin
Biotin
Vitamin B7, Vitamin H, D-Biotin, Coenzyme R
Summary
Biotin is a water-soluble B-vitamin (vitamin B7) of synthetic origin, commonly included in pet foods to support healthy skin, coat, and metabolic function. Its primary benefit is aiding in the metabolism of fats, proteins, and carbohydrates. Biotin is not used in its natural, free form but is instead utilised as a stable, bioavailable compound to optimise absorption and efficacy in pets.
Why it's used?
Biotin is included as an essential vitamin to support skin, coat, and metabolic health in pets, fulfilling nutritional requirements for complete and balanced diets. Its addition also allows manufacturers to highlight the inclusion of key micronutrients on product labelling, appealing to health-conscious consumers.
Bright pink Vitamin B12 powder in a fine, soft-textured mound on a plain background
Vitamin B12
Vitamin B12
Cobalamin, Cyanocobalamin, Hydroxocobalamin, Methylcobalamin
Summary
Vitamin B12 is a water-soluble vitamin of animal origin, essential for nerve function and red blood cell formation in pets. It is primarily included in pet food to support energy metabolism and overall vitality. Vitamin B12 is not used in its natural, raw form but is instead utilised as a specific compound, such as cyanocobalamin, to ensure stability, safety, and optimal absorption.
Why it's used?
Vitamin B12 is included as an essential nutrient to support metabolic and neurological functions in pets, ensuring the product meets established nutritional standards. Its addition helps manufacturers achieve complete and balanced labelling claims.
Fine white powder texture of pyridoxine hydrochloride, a dog supplement ingredient, shown in close-up detail
Pyridoxine Hydrochloride
Pyridoxine Hydrochloride
Vitamin B6, E300, Pyridoxine HCl, Pyridoxine Monohydrochloride
Summary
Pyridoxine hydrochloride is a synthetic, water-soluble form of vitamin B6, derived from chemical synthesis rather than natural sources. It is added to pet foods to support protein metabolism, nervous system health, and immune function. Unlike naturally occurring vitamin B6 in foods, pyridoxine is utilised in its hydrochloride salt form to ensure stability, safety, and optimal absorption in companion animals.
Why it's used?
Pyridoxine hydrochloride is included as a cost-effective, stable source of vitamin B6 to ensure nutritional adequacy and meet regulatory labelling requirements. Its addition helps manufacturers guarantee consistent vitamin content throughout the product’s shelf life.
Bright yellow riboflavin powder with a fine, slightly grainy texture displayed in a close-up circular view
Riboflavin
Riboflavin
Vitamin B2, E101, Lactoflavin, 7,8-Dimethyl-10-Ribityl Isoalloxazine
Summary
Riboflavin, also known as vitamin B2, is a water-soluble vitamin of synthetic origin commonly added to pet foods. It plays a crucial role in energy metabolism and supports healthy skin, eyes, and nervous system function. Riboflavin is not used in its natural form but is typically utilised as a synthesised compound to ensure stability, safety, and optimal absorption in pet diets.
Why it's used?
Riboflavin is included as an essential vitamin to meet nutritional requirements and ensure regulatory compliance for complete and balanced pet food labelling. Its addition helps optimise the product’s nutrient profile without significantly impacting cost or palatability.
Bright yellow folic acid powder with a fine, slightly textured surface, used as a supplement for dogs
Folic Acid
Folic Acid
Pteroylmonoglutamic Acid, Pteroylglutamic Acid, Vitamin B9, E920
Summary
Folic acid is a synthetic form of vitamin B9, originally derived from plant sources but produced for pet food as a stable, bioavailable compound. Its primary purpose is to support cell division, DNA synthesis, and overall growth in pets. Folic acid is not used in its natural state; instead, it is utilised as a manufactured supplement to optimise absorption and efficacy.
Why it's used?
Folic acid is included as a synthetic vitamin to ensure nutritional adequacy and meet regulatory requirements for B-vitamin content in pet food. Its addition helps standardise nutrient levels across batches, supporting consistent product labelling and animal health.
Fine pale yellow Vitamin D3 powder with a smooth, soft texture, commonly used as a supplement for dogs
Vitamin D3
Vitamin D3
Cholecalciferol, Colecalciferol, Calciol, E671
Summary
Vitamin D3, also known as cholecalciferol, is a fat-soluble vitamin of animal origin commonly derived from lanolin or fish oil. It plays a crucial role in regulating calcium and phosphorus metabolism, supporting healthy bone development in pets. Vitamin D3 is not used in its natural form but is instead utilised as a stabilised compound to ensure safety, efficacy, and optimal absorption in pet food formulations.
Why it's used?
Vitamin D3 is included to ensure the finished product meets established nutritional requirements for canine health, supporting bone development and calcium regulation. Its addition allows manufacturers to guarantee consistent vitamin content regardless of natural variation in raw materials.
Fine white methionine powder with a soft, slightly textured surface, commonly used as a dog supplement ingredient
Methionine
Methionine
L-Methionine, 2-Amino-4-(Methylthio)butyric Acid, E620, L-2-Amino-4-(Methylthio)butyric Acid
Summary
Methionine is an essential amino acid derived from animal or plant sources, crucial for protein synthesis and overall metabolic health in pets. It primarily supports healthy skin, coat, and liver function. Methionine is not used in its raw elemental form; instead, it is incorporated as a specific compound, such as DL-methionine, to optimise safety, stability, and bioavailability in pet food formulations.
Why it's used?
Methionine is included as an essential amino acid to support protein synthesis and overall health in pets, particularly when animal protein sources are limited or variable. It also serves as a cost-effective way to meet nutritional requirements and optimise the amino acid profile of the final product.
Fine white powder texture of magnesium oxide, a common dog supplement for health and wellbeing
Magnesium Oxide
Magnesium Oxide
Magnesia, E530, Magnesium(II) Oxide, Calcined Magnesia
Summary
Magnesium oxide is an inorganic compound derived from the mineral magnesium, typically sourced from natural deposits. It is utilised in pet food as a supplemental source of magnesium, an essential mineral that supports nerve, muscle, and bone health. Rather than its raw metallic form, magnesium is provided as magnesium oxide to optimise safety, stability, and bioavailability for pets.
Why it's used?
Magnesium oxide is included as a cost-effective mineral supplement to ensure adequate magnesium levels in the diet, supporting essential metabolic functions. Its use allows manufacturers to meet nutritional requirements efficiently without significantly impacting product cost or palatability.
Fine grey iron powder with a slightly rough, sandy texture, displayed in a circular shape for dog nutrition context
Iron
Iron
Ferrum, Fe, E1, Elemental Iron
Summary
Iron is an essential mineral sourced from both animal and plant origins, crucial for oxygen transport and energy metabolism in pets. Its primary benefit is supporting healthy red blood cell formation and preventing anaemia. Iron is not used in its natural, raw, or metallic state; instead, it is utilised in pet food as safe, bioavailable compounds such as iron sulphate or iron proteinate to optimise absorption.
Why it's used?
Iron is included as an essential mineral to support healthy blood function and overall metabolism in pets. Its addition ensures the product meets nutritional requirements and regulatory standards for complete and balanced pet food.
Fine, light grey zinc powder with a slightly grainy texture, commonly used as a dog supplement ingredient
Zinc
Zinc
Zn, E579, Zincum, CI 77947
Summary
Zinc is an essential trace mineral sourced from the earth and is vital for numerous biological functions in pets, including immune support and skin health. In pet food, zinc is not used in its natural metallic state; instead, it is utilised as a compound such as zinc sulphate or zinc chelate to optimise safety and absorption, ensuring pets receive its full nutritional benefit.
Why it's used?
Zinc is included as an essential trace mineral to support immune function, skin health, and overall metabolic processes in pets. Its addition ensures nutritional adequacy and compliance with regulatory labelling standards for complete and balanced pet foods.
Bright blue copper powder with a fine, slightly textured surface, used as a dog supplement ingredient
Copper
Copper
Cu, ECP, CI 77400, C.I. 77400
Summary
Copper is an essential trace mineral sourced from the earth and is vital for numerous physiological functions in pets. It primarily supports red blood cell formation, connective tissue development, and immune system health. Copper is not used in its natural metallic state; instead, it is incorporated into pet food as safe, bioavailable compounds such as copper sulphate or copper proteinate to optimise absorption and efficacy.
Why it's used?
Copper is included as an essential trace mineral to meet nutritional requirements for dogs, supporting enzyme function and red blood cell formation. Its addition ensures compliance with regulatory standards for complete and balanced pet food labelling.
Pale beige manganese powder with a fine, slightly clumpy texture, used as a dog supplement ingredient
Manganese
Manganese
E34, Manganum, Mn, EINECS 231-105-1
Summary
Manganese is an essential trace mineral sourced from the earth and is vital for numerous metabolic processes in pets. It primarily supports bone development, enzyme function, and antioxidant defence. Manganese is not used in its natural metallic state; instead, it is incorporated into pet food as a safe, bioavailable compound such as manganese sulphate or manganese oxide to optimise absorption and efficacy.
Why it's used?
Manganese is included as an essential trace mineral to support metabolic and skeletal health in pets, fulfilling nutritional requirements for complete and balanced pet food. Its addition ensures compliance with regulatory standards and appeals to consumers seeking scientifically formulated diets.
Fine off-white iodine powder with a soft, slightly grainy texture, used as a supplement ingredient for dogs
Iodine
Iodine
Elemental I, E127, Iodum, CAS 7553-56-2
Summary
Iodine is an essential trace mineral sourced primarily from seaweed or mineral deposits. It plays a critical role in supporting healthy thyroid function and hormone production in pets. Iodine is not used in its natural elemental form due to safety and bioavailability concerns; instead, it is typically incorporated as a compound such as potassium iodide or calcium iodate to optimise absorption and efficacy.
Why it's used?
Iodine is included as an essential trace mineral to support thyroid function and overall metabolic health in pets. Its addition ensures nutritional adequacy and compliance with regulatory labelling standards for complete and balanced pet foods.
Light beige selenium powder with a fine, slightly clumpy texture, shown as a common dog supplement ingredient
Selenium
Selenium
Selen, E578, Atomic Number 34, Se
Summary
Selenium is an essential trace mineral sourced from the earth, typically derived from plant or yeast-based compounds for pet food use. It plays a crucial role in supporting antioxidant defences and thyroid function. Selenium is not used in its natural, raw metallic state; instead, it is utilised as a safe, bioavailable compound such as sodium selenite or selenomethionine to optimise absorption and efficacy.
Why it's used?
Selenium is included as an essential trace mineral to meet nutritional requirements and support overall health in pets. Its addition ensures compliance with regulatory standards for complete and balanced pet food formulations.
Fine white taurine powder with a soft, fluffy texture, commonly used as a supplement for dogs
Taurine
Taurine
2-Aminoethanesulphonic Acid, L-Taurine, E107, 2-Aminoethane-1-Sulphonic Acid
Summary
Taurine is a naturally occurring amino sulfonic acid derived from animal sources, particularly meat and fish. It is added to pet food to support cardiovascular health, vision, and proper immune function, especially in cats who cannot synthesise it sufficiently. Taurine is not used in its raw form; instead, it is incorporated as a purified, synthesised compound to ensure stability, safety, and optimal absorption.
Why it's used?
Taurine is included to ensure adequate levels of this essential amino acid, particularly in diets where animal protein content may be insufficient to meet canine or feline nutritional requirements. Its addition supports cardiovascular health and is often used to address consumer concerns about diet-associated heart issues.
Amber-brown liquid drop of mixed tocopherols with a glossy, smooth texture on a white background
Mixed Tocopherols
Mixed Tocopherols
Tocopherols, E306, Natural Tocopherols Concentrate, D-Alpha Tocopherol Concentrate
Summary
Mixed tocopherols are a blend of compounds derived from plant oils, primarily functioning as a source of vitamin E. Their main purpose in pet food is to act as natural antioxidants, helping to preserve the freshness of fats and oils. Rather than being used in their isolated, pure form, mixed tocopherols are incorporated as stabilised extracts to optimise safety, efficacy, and nutrient retention.
Why it's used?
Mixed tocopherols are included as a natural preservative to extend shelf life by slowing the oxidation of fats and oils in pet food. They are often used as a label-friendly alternative to synthetic preservatives to appeal to consumer preferences for natural ingredients.
Too vague to identify
Natural Flavour
Natural Flavour
Natural Flavouring, Flavouring Substance, Flavouring Preparation, Flavouring Complex
Summary
Natural flavour is a food additive derived from animal or plant sources, designed to enhance the palatability of pet food. Its primary purpose is to improve taste and encourage consistent consumption. Rather than being used in its original raw form, natural flavour is typically processed and concentrated to ensure safety, stability, and uniformity in pet food formulations, while maintaining its natural origin.
Why it's used?
Natural flavour is included to enhance palatability, encouraging pets to consume the product. It also allows manufacturers to improve taste without specifying individual flavouring agents, supporting flexible formulation and label-friendly marketing.
Bright orange, finely textured beta carotene powder in a close-up circular view for dog health supplements
Beta Carotene
Beta Carotene
Provitamin A, E160a, All-Trans-Beta-Carotene, CI 40800
Summary
Beta carotene is a plant-derived pigment and precursor to vitamin A, commonly sourced from carrots and other colourful vegetables. Its primary nutritional benefit is supporting vision, immune function, and antioxidant defence. In pet food, beta carotene is utilised in its extracted or purified form rather than as whole vegetables, ensuring consistent potency and bioavailability for optimal health outcomes.
Why it's used?
Beta carotene is included as a natural source of vitamin A and as a colour-enhancing agent to improve the visual appeal of the product. Its presence also allows for label-friendly marketing, appealing to consumers seeking natural additives.

About

Brand
Hill's Prescription Diet
Company
Hill's Pet Nutrition
Manufactured
United States
Type
Kibble
Life Stage
Adult
Breed Size
Medium, Large
Feeding Type
Complete Meal
Processing Level
High

Product Tags

Single Protein
Gluten Free
Dairy Free

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About the Brand

Hill's Prescription Diet

Hill's Prescription Diet is a veterinary-therapeutic food line from Hill's Pet Nutrition, originating in 1948. Formulas are designed to nutritionally manage specific clinical conditions such as kidney disease, allergies, and diabetes.

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z/d Hydrolysed Chicken Flavour Dry Dog Food
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