Gastroenteritis, pneumonia, dietary deficiencies, infection and high fever, poisonings, endocrine problems, parasites, heavy lactation, friction, ringworm, mange, congenital disorders.Symptoms
Technically, alopecia implies hair loss in the absence of underlying skin diseases. It is important to note the location of the bald spots and whether or not they are "bilateral" (identical on both sides of the body).Treatment
First, find the primary cause and treat that. May need to take skin scrapings to rule out external parasites. May need blood work to evaluate endocrine problems.
Second, keep the skin clean and soft. Treat the affected skin with mild lotions. There may be some itching; this can be treated with mild lotions.
A unique situation arises in late summer in does who are heavy milkers or raising multiple two or three kids. They may develop alopecia along each side of the spine. I’m not sure of the all the technical causes of this, but we apply a little cow-calf fly powder to guard against parasites. After the kids have been weaned or milking stops and the doe has had a chance to put on a little weight, the hair always returns on its own. When milk production is stopped, withhold grain a few days. Then moderate feeding can be resumed until weight returns to normal.