· Rain Rot: Common bacterial skin disease in horses; Characterized by matted hair and skin lesions that ooze and form clumps.
· Rabies: Horses can get rabies by being bitten by a rabid animal. Such as skunk, fox, or raccoon.
· Ringworm: common fungal skin infection of many animal species. Horses show circular patches of hair loss with crusting and scaling of the skin. Can be transmitted from skin to skin contact with the area can contact it.
· Other diseases to look for are salmonellosis, anthrax, brucellosis and leptosposis.
Also do your research.