Simparica Trio for Dogs is a highly effective treatment for internal and external parasites in dogs. This product kills fleas and ticks and eliminates fleas before it can lay eggs. It also aids in treatment of intestinal worms (roundworms and hookworms). Moreover, Simparica Trio eliminates five types of ticks – American dog ticks, brown dog ticks, lone star ticks, deer ticks and gulf coast ticks. Simparica Trio is a highly recommended treatment for dogs.