Advocate Spot-On Cat, Monthly Spot-On Protection From Fleas, Heartworm & Worms Treatment for Cats Over 4 kg. Advocate Spot-On is a fast-acting, water resistant, easy to apply monthly treatment offering comprehensive parasite protection. It kills fleas fast and on contact, so there's no need for them to bite. Reinfesting fleas stop biting in 3-5 minutes and are killed within 1 hour. Larval flea stages are killed in the cat's surroundings, and it reduces the incidence of flea allergy dermatitis. Advocate Spot-On also treats and controls mange and ear mites. Advocate Spot-On is a cat wormer that prevents heartworm disease and treats and controls adult & juvenile stages of roundworms and hookworms. Advocate Spot-On is unique, providing ongoing protection from new worm infestations between treatments, meaning less egg shedding and risk of disease. Advocate Spot-On is the only product that protects against both lungworm species (common cat and Eucoleus lungworm). Safe for use in kittens from 9 weeks of age and any weight. Also safe for use on ferrets from 0.8 kg for flea and heartworm protection.