Bio Groom Repel 35 Flea Spray is a powerful, long-lasting flea and tick repellent for dogs and horses. It provides up to 35 days of protection from fleas, ticks, lice, and louse eggs, as well as face, horn, and horseflies, mosquitoes, and gnats on horses. Ideal for continued use, Repel-35 is gentle yet effective on all pets.