I know this post was from awhile ago, but I pray you'll reply if you see this. My shih tzu Bichon mix has had two cases of HGE since November with the exact same symptoms and everything you've described. Tested negative for Addison's, haven't been able to afford a test for IBD yet. Please tell me if you ever found out what Tyke had. My baby is only 4 years old and it's breaking his Mama's heart not knowing what's wrong with him. I'm so afraid it'll happen again and possibly soon, just because he's been having weird ulcer-like symptoms recently (he was treated for a week for an ulcer and felt a little better, but then got bad again as soon as the medications ended).
