According to Valentine, the list of EPSM signs includes symmetric loss of muscling, especially of the rump, shoulders and topline, weakness, usually in the hindquarters, trembling, often after exercise, difficulty in backing/reluctance to back, poor performance, lack of energy, stumbling, reluctance to pick up the feet for farriery work, a slightly stiff, awkward or short-strided gait in one or both hind limbs, “locking”...