[Ellie May]

I missed the part about her peeing on the bed.
With that and crystals in the urine and no urinary tract infection, I'd have to question whether or not she has stones.

We've never dealt with crystals or bloody stool here, but Ellie has had just about everything else on your list.

I really think she is going to need to be on either a homecooked or an intestinal diet. The HA is only 18% protein which is quite low, so I have no idea what your vet is talking about and I'm guessing they don't know themselves.

If the BUN comes back abnormal again, then I'd get concerned. With her having a hgih BUN and peeing on the bed, there could be a problem, but then she has crystals too, so there may be something going on with her bladder.

It sounds like the vet is so concerned about the possible kidney issues that they are letting the intestines go and that isn't a good thing at all. She is going to need more intestinal testing. If everything comes back perfect and it can't be controlled by safe meds or diet change, biopsy will need to be considered. If all tests are normal, it may very well be IBD. Unfortunately, there are other things it could be that can't always be diagnosed with bloodwork. And the drugs that would be used next shouldn't be given in certain circumstances without a diagnosis. So, I think I'd find a vet that you can trust.