Roundworms are a common type of intestinal parasite in dogs. They can grow quite large, sometimes up to several inches long, and have a distinct head with a mouth at one end.
While it's not pleasant to think about, it's important to remember that roundworm infections are treatable with medication prescribed by your veterinarian.
If you're concerned about your dog having worms, it's always best to consult with your veterinarian. They can help you identify the type of worm, determine the best course of treatment, and advise on preventative measures.