The increased stress load can quickly compromise the health of an animal. Blister beetles do not attack horses, but they are toxic to horses and can contaminate alfalfa hay. Management of these Insects is different from other home pests in that it requires modification of alfalfa production practices. Flies Face fly and house fly. These flies are nonbiting, annoying, small black flies.
Face flies closely resemble the common house fly but are more persistent pests of animals.
They feed on the tear ducts of the eyes, around the nose or on wounds and cuts. Both species breed in fresh animal manure. This small, grayish-black stable fly has a painful bite. It pierces the skin and sucks blood as a food source. The stable fly lays its eggs in piles of decaying vegetation such as grass clippings, manure and urine, contaminated hay and wet feed.