Compared across 2 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.
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K9 Advantix II is a topical spot-on for dogs that kills fleas, ticks and mosquitoes, and also repels and kills biting flies, lice and sand flies. It is one of the few dog flea products that also targets mosquitoes, which makes it useful in heartworm-risk areas, though it does not prevent heartworm itself. It suits dog owners who want broad parasite coverage in a monthly tube rather than an oral chew. Unlike oral flea pills, it works on contact, so fleas do not need to bite to die, but it is toxic to cats and must never be applied to them.
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Lowest price we've seen: $14.98 on Nov 11 at Chewy. Tracked across 2 stores since Nov 11.
Owners generally report strong flea and tick control, especially in yards with heavy flea pressure, and value the added mosquito protection. Complaints center on the greasy residue, the smell, and occasional skin reactions at the spot-on site.
