Worms are parasites that can get inside your puppy's heart, blood stream, and/or digestive system a number of ways, usually through insect bites or eating fecal matter from infested animals, which you should try to keep your pet from doing.

Roundworms and Hookworms

Tapeworms

Tapeworms, pictured above, are white worms structured in segments.  If 1/2 inch long or less, it is probably a tapeworm segment. When the segments dry they look like grains of brown rice and may stick to your dog's hair. If you see anything like this, let your vet know and they will provide medicine. Prescription tapeworm drugs are extremely effective, very safe, and cause no discomfort. Non prescription tapeworm medications don't work very well and often cause intestinal cramps and diarrhea.  Before providing a prescription, the vet will need the dog's weight.