Well, things seem to be trending downward

Vet visit on Monday with only a CBC done. No meds administered. My oldster's bloodwork was normal, except for BUN and creatinine levels which were high; apparently not yet 'crisis' high, but enough to indicate likely renal function issues. Vet feels this is a possible source of his refusal to eat and said this was likely cooking along for quite some time. Vet handed him a fistful of wet alfalfa and my oldster ate it all, prompting him to remark "...he wants to eat", which is not the same as, "he has no interest in eating". I'm surprised he didn't give any rx intervention during our visit. He suggested giving alfalfa to see how things go.
Chopped (bagged) alfalfa, soaked alfalfa cubes, chopped forage mix (orchard/timothy/alf)---all set out in separate pans, all tasted by my oldster, none of the rations eaten by my oldster. Yesterday he did not eat any of the senior feeds provided (some dry, some spiked with applesauce). Last night he barely drank, not like his guzzling during the previous week. This morning he ate about 1# total senior feed, with 1# dribbled out onto the stall mat. He refuses beet pulp shreds (soaked). Even decided against a fluffy flake of his (formerly) usual bermuda hay. Right now I have 10 separate foodstuffs open, trying desperately to entice him to eat.
Oldster will still trot out into the barn pasture, then pick up a canter for a perimeter check. This morning he did a 'scritchy roll' in his turnout, quite satisfied with himself. He asks for feed but only snuffles around in the feed pans then, loses interest. I have 3 feed pans in the pasture for him to inspect each day but they're never touched.
I phoned vet office today to ask if he might give me some rx so I can kickstart some desire to eat. Vet elected to give Vit B12, which DH is picking up for us to administer. I was really hoping for either steroid intervention or possibly treating presumptively for ulcers at this point, but I defer to the vet's experience. I'll pick up a small bale of alfalfa tomorrow; my guy quids bermuda hay and pasture grasses, but has never been fed baled alfalfa, only the bagged products. I must be doing something wrong but I can't figure out what.
