Well in the past week my 15 month old lab's back leg kinda popped out of place 3 times. He will be playing and then just stop and hold it up and hop to me so a can tug it back into place (I can actually feel it pop), after which its like nothing ever happened he just goes about playing. So I think that he has hip displasia because of that and some other symptoms. So I was wondering if anyone could give me an idea about how much it would cost to get the hip xrayed before I start looking for a vet.