Question: what does it mean when a dog throws up a worm?
Answer: Many dogs do not have signs of infection; however, dogs with major roundworm infections, especially puppies, show diarrhea, vomiting, weight loss, dull hair, and a potbellied appearance. The dog may cough if the roundworms move into the lungs. You may notice the adult roundworms in your dog's feces or vomit.