On a dirty or sweaty coat, manmade fabrics might cause skin conditions or even a rash. Verify that the blanket covers the horse adequately. A correctly fitted sheet should cover the belly, and at least part of the gaskin. The sheet shouldn't appear tight over the points of the shoulders, or pressure can rub off tips of the hairs. Regrowing Hair Like other mammals, horses can develop skin and hair problems unrelated to nutrition.
Environmental elements can cause certain disorders.
A rough coat can be the sign of a problem. Instead of lying flat, the hairs form an uneven surface. The ends of the hairs look dull and reddish, and they stand up. A buildup of dead skin, dirt, and loose hairs affect the appearance of the coat. Dermatitis, or inflammatory skin disease, can include signs such as cracks, lesions, nodules, and wheals.