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K9 Advantix II Medium Dog is a monthly topical treatment that kills fleas, ticks, mosquitoes, biting flies and lice on dogs weighing 11 to 20 lbs. It starts working within 12 hours and kills adult fleas on contact, which helps break an existing infestation and prevent a new one. It is a vet-recommended alternative to flea collars and oral pills, and it protects both indoor and outdoor dogs. Unlike flea-only topicals, it also targets mosquitoes and biting flies, though it is not for cats and must not be used on them.
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Owners and reviewers generally report that K9 Advantix II clears fleas and ticks quickly and holds up through the month, including on dogs that swim and spend time outdoors. Complaints center on the greasy residue, the smell, and occasional skin irritation at the application spot.
K9 Advantix II is a monthly topical treatment that helps defend dogs against fleas, ticks, mosquitoes, biting flies, and lice. It is made for medium dogs that weigh 11-20 lbs. and are at least 7 weeks old. It works on both indoor and outdoor dogs.
The formula kills adult fleas on contact, so fleas don't have to bite the dog to die. It starts working within 12 hours of application. It stops existing flea infestations and helps prevent new ones. It also repels pests on contact.
It is fragrance-free and becomes waterproof after 24 hours. No prescription is needed.
