Toby is very lame at the moment, it came on suddenly when we were out for our walk the other day. He had a cruciate op (TPLO) on his left leg in March but this time it is his right leg that has gone. When he was initially x-rayed at the time of his cruciate op it was found that he did have hip dysplasia in his right hip but not severe. The surgeon at the time said that this could just be managed & would not in his opinion require surgery. When I took Toby in to the vets for the problem with his right leg they seemed to think it was related to his hip dysplasia & have ruled out a ruptured cruciate ligament in the affected leg but on reflection I am not convinced. The onset of the injury was instant, not something that became worse over several days. If there is no indication it is a ruptured cruciate (I know they can check the way the leg moves to confirm this) then what else could it be? I am convinced he has ruptured something due to the severity & the fact that even several days later there has been no improvement. I am taking him back on Monday as I want a re-examination & to discuss my concerns but just wondered if there was any suggestions as to what else this could be. Reading up on ruptures it does sound like meniscal tear (there is a slight poppiong noise when he walks) but I am no experience of these sort iof injuries so may be talking rubbish. Does anyone have any ideas of what this could be?