Oilpig

You might want to get this checked out by your vet if they are any good. In addition to our weim, my wife and I have a yorkie. We hadn't noticed him limping or being in any pain but when our new vet felt his back knees, she told us he had a serious problem that allow his knees to come out of socket quite easily. She told us that in most cases the knee pops out and right back in. In his case it was coming out and staying out, yet somehow it didn't bother him.

If you wait until the dog starts developing arthritis, there's nothing you can do and the dog will be in severe pain. If you act quickly, the vet can do surgery to correct the problem. It cost us about $850 per knee. I know that's not what you want to hear, but I imagine you don't want your dog to be in pain either. I'd get it checked out by your vet soon to avoid any unecessary pain for your dog.