my 8 month old rottweiler seems to have very weak hind quarters, they give way sometimes when he moves.the first vet said it was arthritis and gave him anti-inflamatory tablets,then i had him x-rayed at another vets for signs of hip displacia and was told that he was clear of that and also that he did not have arthritis,so i dont know what is wrong with him and i am very worried.

I think it is almost certain that signs of OCD would have been visible on the x-ray so I would not be thinking along those lines. Panosteitis is possibly the most likely and the timescale would fit with the most usual age there this could start.

Regards, John

yep my 7 month pup has got a Pano in his right shoulder - treatment is anti-infalmmatorys ( Metacam ) and plenty of rest. He is moving a bit bettter now but it's going to be a long haul I think before he's completely sound .

Good luck