K9 Advantix II Monthly Flea & Tick Prevention for Large Dogs 21-55 lbs, 6 Doses

Six Months of Unstoppable Protection for Your Large Dog

K9 Advantix II Monthly Flea and Tick Prevention is engineered for large dogs weighing 21 to 55 lbs, delivering a full six months of powerful, waterproof defense in every box. Each of the 6 monthly doses works on contact to kill and repel fleas, ticks, mosquitoes, biting flies, and lice — without your dog ever having to be bitten. Whether your large breed loves hiking trails, dog parks, or backyard adventures, K9 Advantix II is built to keep up.

Kills Fleas at Every Life Stage, Repels What Others Miss

Unlike basic flea collars or single-action treatments, K9 Advantix II attacks fleas at all life stages — eggs, larvae, pupae, and adults — breaking the flea life cycle before it can take hold. It also repels and kills ticks including the American dog tick, brown dog tick, deer tick, and lone star tick, which are known carriers of Lyme disease and other serious illnesses. Fast-acting and long-lasting, each dose starts working within 12 hours and keeps protecting for a full 30 days.

Trusted Across America, Delivered Fast to Your Door

K9 Advantix II has earned the trust of dog owners and veterinarians across the United States for its consistent, proven performance. Application is simple — part the fur between your large dog's shoulder blades and apply the tube directly to the skin once a month. With 6 doses in every pack, you're set for half a year of worry-free protection. Orders ship fast within the US so your dog's defense starts without delay.