Thanks Lori for your response. The adrenal disease was what I suspected, specially since he's been on preds and that sometimes aids the advance of this disease and he's also thinning at the base of his tail. I was just checking to see if there was anything else it could be. He hasn't been rubbing that spot or chewing on the bars (he has a lot of free roam time, when in the cage, he sleeps). So I think you're right, it's probably adrenal. Darn! Thanks for your answer. mjo and the zoo (Phantom, Lady Star, Topanga, Ragine, Bilbo,Frodo,Frito, Pepper, & Caesar, and the dogs Garth and Darwin...r.i.p. Nipper, Lightning, EZ, Cleo & Duke) [Posted in FML issue 2939]