Signs of parasites can vary depending on the type of parasite involved, the number of worms and the age and health status of the pet. Signs can vary from none to any of the following: constipation, diarrhea, flatulence (passing gas), lethargy, pale gums, poor growth rate in puppies and kittens, a potbellied appearance, scooting on the rear end, vomiting, weakness and weight loss. What parasites commonly infect dogs and cats? Hookworms These small worms attach to the intestinal walls and ingest blood. Heavy infections can cause severe blood loss, anemia and pale gums. Pets can pick this parasite up from…