Until 2026, choosing a monthly all-in-one chew for an Australian dog usually meant choosing NexGard Spectra. With Advocate Ultra Chew now on the shelf, the comparison is real — and the answer isn't the same for every dog.
In Short:
Advocate Ultra Chew and NexGard Spectra are both monthly all-in-one chews for Australian dogs and both cover fleas, paralysis ticks and heartworm. The practical difference is on the worms: Advocate Ultra Chew kills tapeworm (including the zoonotic hydatid tapeworm) but not whipworm or lungworm, while NexGard Spectra kills whipworm and lungworm but not tapeworm.
The right choice depends on where your dog lives and whether you'd rather drop the separate quarterly all-wormer or keep cover for whipworm and lungworm.
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.
Frequently Asked Questions
Is Advocate Ultra Chew or NexGard Spectra better overall?
There's no single "better" answer for every dog. Both cover fleas, paralysis ticks, heartworm, mites, roundworm and hookworm. Advocate Ultra Chew adds tapeworm including hydatid; NexGard Spectra adds whipworm, lungworm and eyeworm. The right choice depends on your dog's lifestyle, your region, and whether you'd prefer to drop the quarterly tapeworm wormer or keep cover for whipworm and lungworm.
Does NexGard Spectra cover tapeworm?
No. NexGard Spectra does not cover tapeworm — including the hydatid tapeworm, which is a zoonotic risk most relevant to dogs in rural and pastoral regions. NexGard Spectra users are typically advised to give a separate all-wormer (with praziquantel) every three months to handle tapeworm cover.
Does Advocate Ultra Chew cover whipworm or lungworm?
No. Advocate Ultra Chew is registered to cover paralysis ticks, bush ticks, brown dog ticks, fleas, heartworm, demodex mites, roundworms, hookworms and tapeworms (including hydatid) — but the published coverage list does not include whipworm or lungworm. If your dog is in a known lungworm or whipworm area, talk to your vet about whether a different monthly chew or a layered approach makes sense.
Are both chews safe for the same age and weight range?
Both are registered from 8 weeks of age. The minimum weight differs — NexGard Spectra is registered from 1.35 kg, Advocate Ultra Chew from 2 kg. For very small puppies that haven't yet hit 2 kg, NexGard Spectra is the only one of the two that's licence-appropriate.
Both products use isoxazolines — is that a safety concern?
Both contain a chemical from the isoxazoline family — lotilaner in Advocate Ultra Chew, afoxolaner in NexGard Spectra. Adverse reactions to isoxazolines are rare but can include vomiting, diarrhoea, lethargy, itching, and in very rare cases neurological signs such as seizures. If your dog has a history of seizures, discuss isoxazoline products with your vet before starting either chew.
Which chew is cheaper per dose?
Pricing varies by retailer and by pack size — both products are typically cheaper per dose in 6-packs than in singles. Per-dose pricing in Australia tends to be broadly comparable for the same weight band, though promotional pricing shifts month-to-month. Check the live retailer prices on the product tiles above for current pricing on both.
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