So I have a 3 year old GSD named Lulu. Last August she tore her ACL and 20% meniscus. we had the TPLO surgery and she's been doing great.. sort of. her repaired (right rear) knee is great, but I've noticed two things since the surgery. When she gets up off the couch, after a day of playing, she stretches both legs (left first, right second) almost every time, which she used to not do. Second her left knee now "pops" or "clicks" when she walks. is this another ACL? maybe just meniscus? does this mean more surgery? I'm sick to my stomach to think about this.. please.. any thoughts??