My almost 3 year old black lab/ golden retriever has a slight limp. It's his back right leg. I don't see anything in between his pads and he doesn't seem to yelp when I rub on his leg. He has a slight knot, loose not attached to his leg below his thigh kinda. We went camping over the Memorial Day holiday and he did a lot of running and swimming, I'm hoping he's just sore or pulled something and it will heal. My other concern is he was tested for Lymes before and it came back positive that he had came in contact with a tick but wasn't infected to where he needed treated. He goes to the vet Monday for trimming and hotspots but I'm hoping the vet can get us in today. Makes me sad seeing him not put all his weight on it, but doesn't seem to be in pain. What are your thoughts?