Advocate Flea, Heartworm and Worm Treatment for Dogs 0-4kg is a spot-on flea and worm treatment for dogs weighing 0-4kg. Advocate Flea, Heartworm and Worm Treatment for Dogs 0-4kg is made from a special formula designed to treat and prevent gastrointestinal worms and protect against deadly heartworm. Advocate Flea, Heartworm and Worm Treatment for Dogs 0-4kg is also 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. Advocate Flea, Heartworm and Worm Treatment for Dogs 0-4kg is applied monthly to provide month long flea and worm protection and it is also water resistant. Advocate Flea, Heartworm and Worm Treatment for Dogs 0-4kg comes in a pack of 1.