My 12 year old pit bull mix was just diagnosed with IBS. She has had diarrhea since Nov. she was on Tylan and Hills I/D food. 3 weeks ago while staying with my dad she started vomiting and not eating. After an ultrasound, blood tests, and an endoscopy she was diagnosed with IBS. She has gone from 70 to 65 lbs. She just got the endoscopy and started prednisone yesterday. She is also taking pepcid, cerenia and metronidazole. She is still not eating, sleeping all the time and no tail wagging. Anyone have experience with this. I hate to see her like this.