Again, the simplest changes would be to do under the skin fluids, and try a kidney canned food diet. More palatable than kibble. It isn't a big investment to make in either time or money and it should be obvious pretty quickly if it helps and if he'll tolerate it.
Our vet hasn't even mentioned sub-q fluids. My wife talked to him this morning and asked him about it, and he dismissed the idea without giving any reasoning. He tends to do that with ideas that aren't his. Likewise, we didn't realize until last night that several of these companies make a canned kidney diet. Vet is stuck on recommending Science Diet dry formula and nothing but.
We do have some concerns about whether we could administer fluids ourselves or not, but I guess we'll find out soon.
I wonder if some of his pickiness is from low-level nausea as the toxins build up in his bloodstream.
Yeah, I'm wondering that myself. We've had some issues with him being very picky going back almost two years. Vet thought it was behavioral and the blood was normal at the time. His overall eating pattern really suggested it was more behavior/being spoiled. I will say that he's eaten quite well the past 3 months or so. We made a couple changes to his routine that largely solved the issue.
We had a friend of the family come over last night to see Fasb. She's retired now, but she worked in a couple different vet's offices for about 20 years. She thought he was far better than she expected, based on what we told her. She expected signs of lethargy or dehydration, but didn't really see any. Actually, he was a ball of energy last night. Groomer said much the same thing when we picked him up from her this afternoon.
We're going to take Fasb elsewhere for a second opinion soon as we can get in. Basically, we feel like Fasb's care is reasonably good with the current vet, but communication is poor. Current vet doesn't seem to like answering questions or considering alternatives. If we tell him we're not comfortable with something he's recommending, he either just dismissed we sometimes get snide "well, it's your dog. Don't do it then" answers. We've been mildly dissatisfied for awhile, but it's finally time to find a vet who will take more time to explain things or consider alternatives. We kinda thought he's just in a rush, being a solo practitioner, but other people say that's just his personality.