Advantage – Fleas – Dogs 4kg to 10kg is fast-acting flea treatment for dogs, cats, rabbits and ferrets. Effective, easy to apply spot-on treatment that kills fleas on contact, which means there’s no need for them to bite. Reinfesting fleas stop biting within just 3-5 minutes and fleas are killed for a month. Safe to use on puppies from birth, pregnant and lactating animals.