I have a large rooster that was given to me. He has been in great health until the last few weeks. He started just laying down more and more and then unable to really get up and walk correctly. He now mostly just lays on side with legs out. He opens his mouth fairly regularly. His feathers are fine-not in a serious molt. His comb color is still bright red and great eye color and follows well. No discharge from either end. He can and will get up to eat and drink. Body is feeling on the light side. Checked for foot injuries and none. He has always had very large spurs and the left one is shriveled half way back and it looks like the right one may do the same. Legs are big and strong but scales look like they are drying out. It is not scally mite on legs though. Treated him for body lice and am giving him electrolites in water. He is isolated from all others but I have no clue at this point other than maybe a vitamin deficiency? Any ideas or thoughts?