Horse and donkey health care in South Dakota will include knowledge of the bot fly. The three common bot flies are the common horse bot fly, the nose bot fly and the throat bot fly. If the bot fly larvae are left unchecked in the intestinal tract complications can arise. Larvae present in large numbers in the stomach can cause blockages and lead to colic. Contact your equine veterinarian for information on how to identify this pest and what control measures you can use to protect your horse.