Just by virtue of their physical presence, intestinal worms can cause vomiting and diarrhoea in cats and dogs.
Their varying feeding habits can also damage an animal’s health in different ways. Tapeworms, for instance, anchor themselves to the gut wall and feed on the animal’s blood. Not surprisingly, a heavy infestation can cause anaemia, lethargy, loss of appetite and a dull lifeless coat.
Roundworms, which live freely in the gut and live off the contents, can cause a similar range of symptoms and are particularly threatening to puppies and kittens.
