Thanks for your response. He is also on a joint supplement. He was his normal self until mid morning and then started crying continuously - I was in the other room so I didn't see what if anything happened. Since then he cries when he moves while lying down, tries to get up or lay down. I've gotten him out twice to pee, and he could barely make the low step, and also would trot with short steps as opposed to walking.
Because he is in alot of pain, and because this condition far exceeds his "normal" 12 yr old state, I guess what I am trying to figure out if he needs to go to the emergency vet or if I can wait until monday to go to his regular vet. Any advice there would be helpful.
Is there anything you can recommend that I can do to ease his pain until Monday? I am really short of money and the e-vets in my area are so expensive. I