Many times the presence of parasite eggs or genetic material is found under the microscope or in stool ... of worms in dogs and cats—and the potential health risks they pose to humans—varies.

Your cat may have worms if they are vomiting, losing weight, or you see worms in their stool. Cats may get roundworms, tapeworms, hookworms, or heartworms. You can treat a worm infestation with ...