Advocate Ultra Chew vs NexGard Spectra (Australia 2026)

What Actually Differs Between Two Monthly All-in-One Chews

On the shelf, monthly all-in-one parasite chews look interchangeable. They're all once-a-month, all chewable, all marketed against the same headline parasites. The differences sit underneath — in the specific list of worms each one kills, the active-ingredient class, the weight-band fit, and how each one handles edge cases like very small dogs, very large dogs, and dogs that scavenge in rural areas.

The four things worth comparing on any two chews are coverage breadth (which exact parasites — not just "worms"), weight-band fit (the lower and upper limits, and how cleanly your dog sits inside one band), active-ingredient class (most modern flea-and-tick chews use isoxazolines, with their own safety profile), and what's missing (every chew leaves a gap somewhere — knowing what isn't covered tells you whether you'll need a second product).

Why the Worm List Matters More Than It Looks

Most owners read "covers worms" on the box and assume that means all worms. It usually doesn't. There are at least six relevant intestinal and tissue worms in Australian dogs: roundworm, hookworm, whipworm, tapeworm (including hydatid), heartworm and lungworm. No single monthly chew currently covers all six. Different products win on different ones, which is why the worm list — not the flea-and-tick claim — is usually the deciding factor when comparing two chews that are otherwise similar.

Side-by-Side Comparison

The Real Tradeoff: Tapeworm vs Whipworm and Lungworm

The two chews share most of their headline coverage. Where they differ is at the long tail of the worm list. Advocate Ultra Chew adds tapeworm cover — including the zoonotic hydatid tapeworm — which removes the need for the separate quarterly all-wormer most NexGard Spectra owners are still giving. NexGard Spectra adds whipworm, lungworm and eyeworm, which Advocate Ultra Chew doesn't.

There is no chew on the Australian market that covers everything in this list, so picking one means deciding which gap you'd rather close with a second product.

Which Chew Wins, by Use Case

Rural, pastoral, or scavenging dogs: Advocate Ultra Chew. Hydatid tapeworm risk is highest in pastoral areas where dogs may eat raw offal, and NexGard Spectra users in those regions still need a separate quarterly tapeworm wormer.

Suburban dogs in lungworm or whipworm areas: NexGard Spectra. Lungworm risk is concentrated in regions with high slug and snail populations, and an Advocate Ultra Chew user in those areas would need a separate lungworm-active product.

Toy breeds under 2 kg: NexGard Spectra (its minimum weight is 1.35 kg).

Giant breeds over 45 kg: NexGard Spectra (its top band runs to 60 kg). Most suburban dogs in the 2 – 45 kg range with no specific lungworm or whipworm exposure: either works, and Advocate Ultra Chew has the edge because the tapeworm cover removes one product from the routine.