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.