Horse brushes come on many styles and have specific uses. A stiff horse brush has bristles that are made to remove mud and other heavy debris. These brushes also work well on the main and tail to help remove tangles. Some times it is best to use a bit of water or de-tangeler on the horses mane or tail to keep the hair from breaking. Horse Tack Company has a great selection of stiff horse brushes as well as other horse grooming supplies.