Thank you so much for your help and your questions! Yes to everything. This does not appear to be Fanconi-related, though you never know. Kidney values are fine– very good, actually-- for a Fanconi dog, except for the Alk Phos, but the other liver values are within normal range. Vet did a bile duct test, thyroid, urine analysis, fecal, x-rays, abdominal ultrasound, CBC, gases, electrolytes. Almost all of his values are very good for a senior. He doesn't have the head tilt, balance, gait or eye issues for Vestibular, and he doesn't have the weight gain or appetite with Cushings. And those values are normal. He has no jaundice, no signs of paralysis, no drooling, no eye issues and no sign of infection.
It seems to be his tongue. He can't use it. He wants to drink and makes smacking noises with his mouth, but he can't get his tongue out to lap or lick. We checked for a throat obstruction, dental issues, tongue lesions, ulcers, even a splinter. I'm taking him in right now for another IV with fluids and antibiotics-- have been doing this twice a day. He wants the food and water-- will take it gratefully through a syringe-- but can't get to it on his own. This is so weird. Please keep the ideas coming. We will try anything. He so wants to live, and of course, he is my baby!