The Advantus Flea Control Soft Chews for Large Dogs are a fast-acting treatment of flea infestations. These flea treatments for dogs start killing fleas within 1 hour with just a single dose. In the event of continued infestation, you can repeat treatment as often as once per day. These flavored soft chews are for dogs and puppies of 10 weeks of age and older. You can start treatment immediately when you see fleas on your dog. Our flea treating soft chews were designed with flexibility in mind, so you can use one chew per day because the active ingredient quickly dissipates in your dog's system. If your dog has food allergies to ingredients like chicken or beef, our treatment is a suitable option because it does not contain any animal protein. The Advantus dog flea treatments start working fast and can be used together with heartworm preventatives, dewormers, shampoos and antibiotics. Warning: Not for human use. Keep this product and all drugs out of the reach of children and pets.