K9 Advantix is an effective solution for preventing fleas, ticks, mosquitoes, biting flies, and lice for large dogs weighing 21 to 55 pounds. This easy-to-use topical treatment is a great alternative to flea collars and hard pills, providing fast relief within 12 hours of application. K9 Advantix quickly eliminates existing flea infestations and stops new ones by killing adult fleas on contact before they have a chance to lay eggs or bite your dog. This means you and your furry friend can enjoy your time together without the discomfort of pests. Designed for dogs at least 7 weeks old, K9 Advantix ensures your pet's comfort and safety. Remember to follow the usage instructions carefully and keep it away from cats to ensure the best results. Enjoy worry-free outdoor activities knowing your dog is protected.