Compared across 3 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 and lice. It is a monthly treatment applied between the shoulder blades, sold here in a two-dose pack sized for extra-large dogs (26–44 kg). Its main advantage over Frontline Plus is mosquito and biting-fly coverage; its main drawback is that it is toxic to cats, so multi-pet homes must separate treated dogs from cats for a few hours. Owners generally report fast flea knockdown and long-lasting tick protection, though some note the greasy spot and strong smell right after application.
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Lowest price we've seen: $14.98 on Nov 11 at Walmart. Tracked across 3 stores since Nov 11.
Owners of large dogs mostly report quick flea kill and fewer ticks after hikes and yard time, and many value the mosquito coverage. Complaints center on the greasy residue, the smell, and occasional skin irritation at the spot.
