Hind leg stiffness/lameness
My 12 year old QH/paint mare Dolly, has had a lameness in her hind leg for a while, and only now seems to be getting worse. It is only really noticeable whens she is walking, and doesn't seem to cause her any much pain. Its her right hind leg, and when she walks it is almost half frozen in place and she has to lift her hip up high to clear the ground. Her hock doesn't seem to bend as much as it should. She will w/t/c with no real reluctance to move, and I always kind of let her go in her pace when she needs. Currently, she is not in hard work at all. I got her about 2 years ago, and she had't been ridden in several years so I basically restarted her. I haven't been really riding her, just sitting on her, continuing to get her used to my legs.
To re explain, it almost looks like she has a super stiff hip or something and she can't quite bend her hock or leg fully to walk normally. She doesn't necessarily have a reluctance to move, and walks at any speed, but just doesn't walk normal at all. I will lunge her occasionally through the week to keep her from getting stiff and keeping everything moving. Its almost like its not even there (she acts completely normal) but it is super obvious something is up.
Please let me know if you have any experience or anything to say about what may be the problem.
Thanks so much :)