K9 Advantix II Flea and Tick Treatment for Medium Dogs 11-20lbs, 6 Doses

Powerful Protection That Goes the Distance

K9 Advantix II is a veterinarian-recommended flea and tick treatment designed specifically for medium dogs weighing 11 to 20 lbs. This 6-dose supply delivers a full six months of continuous, waterproof protection against fleas, ticks, mosquitoes, biting flies, and lice — all in one easy-to-apply topical solution. Whether your dog loves splashing through puddles or rolling in the grass, K9 Advantix II keeps working through it all.

Multi-Pest Defense in Every Single Dose

Unlike single-action treatments, K9 Advantix II kills and repels fleas at all life stages — eggs, larvae, and adults — while also targeting ticks including those that carry Lyme disease. Its unique formula kills fleas through contact, meaning pests don't have to bite your dog to die. Each monthly application is fast-acting, starting to kill fleas within 12 hours, giving your dog fast relief and lasting peace of mind for you.

Trusted by Pet Owners Across the USA

K9 Advantix II has been a go-to choice for American dog owners for years, trusted for its proven efficacy and ease of use. Simply part the fur between your dog's shoulder blades and apply the entire contents of one tube directly to the skin — no mess, no fuss. With 6 doses included, you're covered for half a year. Ships fast within the US so your pup can start their protection without delay.