There are many different types of worms that can infect dogs. Those of most concern are roundworms, tapeworms, heartworms, hook and whipworms. Whilst each type of worm has a slightly different life cycle, the dog’s symptoms can be consistent with different types of worm infections. Thus, it is not possible to determine what sort of worm your dog has based on symptoms alone, and tests may be necessary. However, knowing the general symptoms, risks, and characteristics of different types of worms can help you treat and care for your canine friend.