My 20mo old female pitbull mix has been dealing with some tummy issues for months now. It started off very random, but has now became a weekly, sometimes daily problem. Her primary symptoms are: gurgling bowels, diarrhea and vomiting, loss of appetite. I have switched her food a few times, with no help, and she's now on a sensitive stomach grain free formula. Her vomit is usually clear or foamy, with grass if she's eaten some, and on two occasions, had fresh blood in it.