They did x-rays that showed no bone tumor (which the dr. was pleasantly surprised about, considering the amount of pain and acute onset). There was mild hip dysplasia and evidence of inflammation. He felt it was probably due to a severe sprain of the major ligaments, treatment being rest, narcotics and anti-inflammatory drugs. Last night Cody was pretty wobbly- not putting any weight on the right back leg, and stumbling badly with the other legs (probably due to the sedative given for the x-ray), and very out of it. He didn't even wag his tail when he saw us. It was pretty disconcerting. This morning he is much better, even tried to jump when I fed him breakfast.