My 9 month old pitbull puppy has had bad diiarhea for the past week. He was having this problem before I got him dewormed for hook worms. Within a week his poop was normal. Its been a month and a half since then and its coming back, Ive also noticed small pink worms with a hammerhead in his poop. I took him back to the vet and told him about the worms, and basically he said I was seeing things, that he shouldnt have worms. I also heard I can use 1 tablespoon of PeptoBismol and that will help with dog diiarhea, is that true?