Protect your furry friend from fleas, ticks, and mosquitoes with Sergeant's K-9 Advantix II for dogs weighing 21-55 lbs. This powerful topical treatment not only kills pests on contact but also repels them, preventing future infestations. With just one application, your dog will be protected for up to 30 days, giving you peace of mind and your pet relief from itching and discomfort. Say goodbye to pesky parasites and hello to a happy, healthy pup with Sergeant's K-9 Advantix II.