I wonder why the vet did not put Pouncer on a stomach acid controller, like famotidine(pepcid). Ralph gets 2.5mg(a 10mg cut into quarters) 15 minutes BEFORE he eats and that seems to help with the vomiting. See what your vet thinks. Be careful with the predisone, it has to be tapered slowly...Prayers for Pouncer(and you)!!