Osteoarthritis

[Wildside]

Seems to be what is causing my doggy so much pain. Is there anyone around here that might be able to help me understand this condition? A physical therapist maybe? I'd like to know what could aggravate the joints and maybe some exercises to help him. Before this weekend he could still climb up on the furniture, still climb stairs and still walk 1/2 a mile with no problems. I want to keep this from affecting his quality of life for as long as I possibly can. In my opinion there has never been a more awesome dog to walk the face of this earth and he deserves the very best I can give him to the end of his days. I'm open to all suggestions regarding his care.