[Dudley's Mom]

I don't know what happened but my little 6 pound poodle brother of Mickey is crying when I pick him up. He is eating good and doing okay in the bathroom department. His nose is cold and wet but he seems to be in pain. I went to the store and came home to find him like this. He went for a walk with us, but yelped when he jumped down off the couch.It seems to be in his hind quarters. Any ideas what may have happened?