Advantage Flea Treatment for Small Cats 0-4kg is a spot-on flea treatment for small cats and kittens up to 4kg. Advantage Flea Treatment for Small Cats 0-4kg is effective in breaking the flea life-cycle and stops fleas from feeding within 3 to 5 minutes of application and kills adult fleas and larvae within 20 minutes. Advantage Flea Treatment for Small Cats 0-4kg only needs to be applied monthly as it provides month long flea protection. It is also water resistant and safe for use on kittens of any age. Advantage Flea Treatment for Small Cats 0-4kg is available in a pack of 3 and 6 monthly treatment.