No, this is generally not fatal. The most thorough diagnostic test would be a full thickness intestinal biopsy. A lot of times this is replaced with biopsy by endoscopy. It isn't quite as good for getting good samples, but is much easier on the pup. This would rule out anything fatal.
I'm not sure you need to go that far yet. Has your vet mentioned what the next step is?
Pepcid shouldn't hurt, but if this is diarrhea I don't think it is going to do much.
What antibiotic was used? Did the vet consider using it longer term if it worked at all?
Exactly which foods have you tried? If this started four weeks ago and she has already been on two new foods that could be a problem. Ideally (unless they do absolutely terrible when trying a new rx food) you need to use an intestinal food for 3 weeks to judge its worth.
What lab work has been done? Any vomiting?
Sometimes IBD can be controlled with food if it is not related to an underlying issue. My Yorkie has it. I was about to have her scoped, but she ended up doing better every time I thought about it. Then we found the correct food for her.
If your vet does send you to LSU I wouldn't hesitate to go (although that may not be necessary). I've talked to one of the vets there (about their vet school, not my dog) and I would definitely let him see my pup if he is seeing patients. You can PM me for his name if you want.
No treats or edible chews until this is resolved..
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