So Molly started holding up her right rear leg on Tuesday night. We thought, okay, probably a muscle strain from having too much at Yosemite last weekend. We did strict rest and gave her metacam; carried her down/up the stairs to the backyard and kept her on leash for potty trips. This morning, I notice swelling around the hock that I did not see over the previous days of checking her over so I called the vet asap while trying to control my panic.
Four x-rays were taken and all the bones along the stifle and hock look fine - no cracks and everything is seated where they should be. No shifting of the metal plate or any of the screws in her knee and no signs of early arthritis in any of the joints.
We're doing another week of strict rest, cold compresses, metacam and also got some tramadol to use as needed. Molly's surgeon does not work on Saturday's but he will be reviewing the x-rays when he gets in Monday and comparing them to the previous x-rays from her knee surgeries.
Our vet said that while it is rare, it could be a damaged tendon. Anyone else ever seen or experienced this? The swelling is centered around and below the hock and she refuses to bear weight on her leg.

