Lamborghini is 13 years old. Last fall we discovered he was hyperthyroid, and possibly diabetic. Got him on thyroid medicine (methimazole transdermal), which seems to be controlling it fine now, and switched him to FF classics pate, and his blood sugar numbers became good. He had lost a bunch of weight, he should be 13-14 pounds, he was down to 11 pounds even, and was no longer jumping onto the couch, had to climb with difficulty. We now have him at about 12-1/2 pounds and holding. During the diagnosis period, and after a long day at the vet for testing, later that night he could only walk by shuffling, which gradually got better after a few days (wondering if they scruffed him too hard at the vet??). That stopped and he has been walking normally for months now. But he hasn't regained his mobility (jumping/climbing), and recently it seems worse. Started him on zobaline a couple months ago, but now his lower back looks sort of humped when he walks, and he looks stiff and has a smaller, sort of hobbled stride. At the same time through all this, I noticed that when I pet his head, I feel a ridge in the center of his skull, running front to back, that I'm sure was not there in his younger, pre-illness life. At first we thought maybe it was when he lost so much weight, but now I don't think so, he has a prominent skull ridge. His face, down where the whisker "cheeks" are, seems to be a little longer, like the little puffs where his whiskers come out of are now protruding more. However, his color lightened up a bit (he's a grey tiger) when we got him on thyroid medicine, so maybe it's that his whisker puffs are just much paler now and so they appear to be farther forward? We do not test blood sugar on our own, and he's showing no signs of diabetes since we got him on FF (no extra drinking, peeing, weight loss, etc.) But what would be changing his skull and spine and possibly face? We can't afford to just take him to the vet and say "start running tests until you figure it out." Need some ideas or areas to focus on.