Blog Posts

Advantage II kills fleas and lice only. K9 Advantix II adds permethrin, so it also kills and repels ticks, mosquitoes and biting flies, but that ingredient makes it dangerous to cats. Here's how to choose.

K9 Advantix II kills and repels fleas, ticks, mosquitoes and biting flies, but it's toxic to cats. Frontline Plus kills fleas, ticks and lice without repelling them, and it's labeled for pregnant and nursing dogs. Here's a side-by-side comparison from the product labels.