Program Flea Killer for Dogs is an oral medication that helps prevent flea infestations on your dog for one month. No messy sprays or dips are required; the convenient flavored tablets can be given directly or mixed into your dog's food. Dogs find its new, tastier formula irresistible. Program Flea Killer works quietly and neatly, and makes your dog an undesirable location for fleas to live. This once-a-month treatment will keep your dog flea-free all year round. Each package comes with a six-month supply of medication and directions for use. Start using it before flea season begins, as it can take a few weeks for the product to become fully effective. Be sure to consult your veterinarian with questions and concerns before use.