Originally posted by DogLover9501
It happened again just then

Its his back left leg, it's like when he bends his "knee" it stays that way, and he cries so much if I try to straighten it out, so I keep rubbing it and it eventually straightens out.

My mom also told me that it happened to him last night too
My previous dog used to suffer with this. Personally, I would have him checked out by a vet. With my dog, it turned out that he was slipping his knee cap simply because the groove where the ball socket fit had worn away.

I also used to rub the knee until the ball 'popped' back into place. It needed an operation to correct it, but it worked wonders