The document discusses the five main types of worms that can infect dogs: tapeworms, hookworms, roundworms, whipworms and heartworms. It provides details on the appearance of each type of worm, where they are located in the dog's body, potential health effects, and recommended treatment options, which generally involve administering deworming medications. Common symptoms across different worm types include vomiting, diarrhea, weight loss and pale gums. Owners are advised to work with a veterinarian to properly diagnose worms and ensure dogs receive the appropriate deworming treatment.