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.

There are a few reasons undigested food might appear in the toilet — and they’re mostly harmless. Here’s why it happens, what you can do about it, and when to seek medical help.

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.

Hammerhead worms are able to reproduce asexually, and do so in a hydralike manner. Experts warn not to attempt to cut the worm in half if you see one, as the two pieces of the worm will then ...

Hammerhead worms are an invasive species and pose a real environmental threat. Here's what to do if you find one.