My 4yo Labrador Retriever Hank recently (two weeks prior) underwent a Tibial Plateau Levelling Osteotomy (TPLO) to repair the torn cruciate ligament in his back left knee. He gradually increased activity in the affected leg, but now seems as if his progress has halted. He’s very hesitant to put anymore weight on that leg. He won’t walk up a small step to get into my bedroom (this was the case before the surgery too). He moves around somewhat freely in the yard, but reverts to standing on three legs or doing a three-legged hop to move around at times. He has taken a bad step two to three times that resulted in a loud cry out. He must be coaxed to move around at all and appears to have developed a plum-sized seroma at surgery site of the infected knee. Could this be leading to the halt in activity/progress? He allows me to massage the muscles above and below the affected knee. We have also been doing some range of motion exercises on both legs.

Seroma?: He allows me to touch it and it is soft to the touch. It feels like a water balloon filled with a slightly more viscous fluid. It is directly above the incision site and the fluid appears to rest directly on top of the knee joint. Per vet recommendation, I discontinued the use of Rimadyl to try to reduce the size of the seroma.

Other symptoms: Licking at the base of tail to the point of seeing some blood in his fur. Excessive licking of the blanket he sleeps on.