Just got back from taking the little guy to the vet. Good news, he has no fracture, no dislocation, no knee problems. She said it could be an old injury or possibly nerve damage, but she did find a bite I missed so he could have been in a fight and it's just tramatized. She gave me some pain medicine and said to keep him contained for 10 days. Dang, and I just got rid of my last playpen. She says he looks like a chi/pom mix and is about a year old. She did some blood work and says he is healthy. Gave him some flea medicine. Unfortunately, he has no microchip. Still haven't heard anything back from my found ads.