Five days ago I let my 3 shelties into the back yard to do their business. It is a fenced yard so I wasn't really paying much attention to them. When my Avery came back in he was limping badly - he was holding his back left leg up and he couldn't seem to put any weight on it. Up until then I hadn't noticed any problems. I rushed him to the vet. They did X-Rays but didn't find anything broken. They did find a bone spur and some arthritis. They put him on pain meds, told me to not to let him play roughly with the other dogs (keep him quite). They did a "drawer test" and said the indication was that he had injured his CCL. They took a video of him limping and consulted with an orthopedic specialist. I spoke with the orthopedic specialist and scheduled surgery for this Friday 2/8 (2 days from now). He will re-examine Avery and take more X-Rays that morning. I will meet with him before the surgery. Starting today, I noticed a lot of improvement in Avery. The first few days after this happened he couldn't put weight on that leg. he held it up. Now he seems to walk normally a lot of time. When he as been resting for a while it seems to bother him again, but then it seems to be OK. If this really is a CCL injury, could it improve in 5 days? Maybe its just a pulled muscle? I didn't think this type of injury showed up on an X-Ray. I've got another day before the surgery is scheduled. I will definitely discuss this with the surgeon, but I would really appreciate knowing about any of your experiences. He will be 11 years old tomorrow (its his birthday) - so I really worry about surgery. I don't want to put him through any unnecessary procedures, but don't want to delay if he really needs it. Any advice would be appreciated.