Dogs get 2 main sorts of worms. Round worms are thin and white and about 2 inches long. Tape worms are much longer and generally passed in little segments that look like grains of rice. If you've seen something that looks like spaghetti it must be either a whole or large portion of a tape worm. There are a number of different Worms that can affect your dog. Roundworms, tapeworms, hookworms, whip worms and heartworms. Some live in intestines and some in the tissue.