I have recently started working with a horse that has a problem with his back left leg. We are not sure what it is and can't send for a vet. It has been going on for a few months now and it has been hard for him. We think it could be a stifle issue but we don't know. He limps at the trot and it makes it worse for him to trot turns. We need help and we can NOT get a vet, the owner of the barn can't afford it. He seems to be slightly depressed from it and I have been doing parelli with him for a week or two.