Our dog is a 6-7 year old mutt. Today he was unable to jump up into the car to go for his daily run in the woods and tonight he is unable to move his lower body much, if at all. He's in our basement, where he goes to be warm, and is unable to get himself up the stairs, though he seems to want to. We tried moving him and he cried out in what seemed like terrible pain, but we can't tell from where. I had a left over hydrocodone from dental surgery and gave him one, which seems to have relaxed him enough to lie down on his mat. We're not sure what to do at this point. We can't even get him upstairs. Any suggestions as to what we can do?