Check out the symptoms colitis in dogs. Duchess gets colitis from time to time that is why she is on a strict diet. Some symptoms of colitis is bloody runny stool that sometimes looks like black tar and occassional vomiting (but not always).
Whenever she gets a bout of colitis, it's usually because of something that she wasn't supposed to eat. The good news is colitius usually clears up in a few days usually own it's on. |