Worms in the stool: This is not something you'll always see, but if your puppy has so many worms that they're visible in the stool, he or she should be taken care of immediately.

Cats who have symptoms like vomiting, soft stool, or a loss of appetite may have roundworms, tapeworms, hookworms, or other kinds of worms.

Are Your Dog's Worms Contagious? Here’s What You Should Know No one likes to think about parasites, but learning more will help you keep your family safe.

Invasive hammerheads worms have been spotted in several U.S. states. Are they dangerous? Here's what experts say you should do if you see them.