Adult dogs with roundworms do not usually show any signs. If they do, it is generally vomiting or diarrhea. They may also have diarrhea and vomiting episodes. Cats may also become infected with roundworms and show similar signs of vomiting and diarrhea. These worms penetrate through an animal's skin, are ingested in the larval form, or are passed through the mother's placenta or milk.
Hookworms are blood feeders.
They attach to the animal's small intestine and leave bleeding sores. Therefore, hookworms may cause anemia and black feces in your pet. There are two common types of tapeworm in pets. One type, Dipylidium caninum is spread when a pet ingests fleas. The other type, Taenia, is spread when the animal eats an infected rodent or rabbit.