Sentinel Spectrum is a multi-spectrum dewormer treatment for dogs. It prevents heartworm infection by killing immature form of heartworm. The oral treatment controls adult hookworms, and removes and prevents roundworms, tapeworms, and whipworms. It provides long-term protection and controls flea infestations and flea allergy dermatitis in dogs by preventing the development of flea eggs and larvae. *Does not kill adult fleas currently on the dog. This monthly dosage protects dogs from all the harmful intestinal worms, prevents heartworms and controls flea infestations -long-term.