Hello everyone, last night I was riding my turning 17 year old quarab mare at our local arena doing some team sorting. I warmed her up like I have done in the past, she has had about a month off during holidays. Well about our third go around I notice her not turning as well and fighting me a little. When our go was over I turned and started to walk out of the arena with her and noticed a severe limp. I got off and checked her out and she was holding her left rear leg slightly off the ground and not wanting to bare weight on it. I was thinking pulled muscle because she pulled one about 6 months ago. She was limping drastically on it last night, but I did not give her anything to mask the pain so she wouldn't hurt herself even further. Well this afternoon I checked her out after work and she isn't limping nearly as bad while walking in a straight line, but when she tries to turn or pivot it is very slow and she limps on her leg. When I started to feel around for heat or swelling, none of the above, I put my hand on her stifle and pushed a little and she brought her leg up like she was going to kick me and I felt something move under my hand. I was a little worried, so I checked her other leg, she let me poke and prod without an issue and everything on her right hind leg felt really tight. My question is do you think she hurt herself considerably, am I overreacting, should she see a vet, is there something else it could be???? Sorry for the long post, please help, I have never had a horse with these symptoms before.