We feed our dogs 3 times a day - breakfast, lunch, dinner. But last year, we started giving them snacks, sometimes treats and oftentimes sweet bread. But later on, we would fry sweet potatoes for their mid afternoon snack. It was many months we have been giving them such snack and we only stopped when Barbie, our youngest dog, had vomitted and wouldn't eat dinner. On the next day, she was okay. Our suspicion was indigestion from the sweet potato. Are you giving your dog snacks regularly?