This can result in the horses being unable to stand and being uncomfortable even when lying down. Rarely, episodes of muscle pain and stiffness can be quite severe. Mildly affected horses, however, may have only one or two episodes/year. Most horses with PSSM have a history of numerous episodes of muscle stiffness at the commencement of training. ![]() Some horses will try pawing and rolling immediately after exercise. They are painful, stiff, sweat profusely, and have firm hard muscles, particularly over their hindquarters. When horses stop moving they may stretch out as if to urinate. However, horses affected with PSSM can exhibit symptoms even without exercise.ĭuring an episode, horses seem lazy, have a shifting lameness, tense up their abdomen, and develop tremors in their flank area. The episodes usually begin after very light exercise such as 10-20 minutes of walking and trotting. ![]() A correlation to when they receive little active turn-out. The signs are most often seen in horses when they are put into initial training or after a lay-up period. Horses with both forms of PSSM have signs typically associated with tying-up such as muscle stiffness, sweating, and reluctance to move.
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