i rescued an older mare that was very malnurished. i've had her for about 2 years now, but about 6 months ago became lame in her back leg, the tendon swelled up and i had only been doing a light warm up, then short trail rides. she has almost perfect confermation, but i haven't been able to tell if it was an old injury showing up, or she hurt herself out to pasture. her leg is pretty much healed, but now her muscles in her hind quarters have tensed up and are hard, i've had her seen by a equine physical therapist, but she is still not 100%