Bad Doer
A horse with a poor appetite, a condition that may be due to nervousness or other causes.  

Bandage
Bandages used on horse's legs are three to six inches wide and are made of a variety of materials. In a race, they are used for support or protection against injury. "Rundown bandages" are used during a race and usually have a pad under the fetlock to avoid injury due to abrasion when the fetlocks sink toward the ground during weight-bearing. A horse may also wear "standing bandages," thick cotton wraps used during shipping and while in the stall to prevent swelling and/or injury.  

Bar Shoe
A horseshoe closed at the back to help support the frog and heel of the hoof. It is often worn by horses with quarter cracks or bruised feet.  

Barren
Used to describe a filly or mare that was bred and did not conceive during the last breeding season.  

Barrier
A starting device used in steeplechasing consisting of an elastic band stretched across the racetrack which springs back when released. Also known as a "tape."  

Bay
A horse color that varies from a yellow-tan to a bright auburn. The mane, tail and lower portion of the legs are always black, except where white markings are present.  

Bearing In (Or Out)
Deviating from a straight course. May be due to weariness, infirmity, inexperience or the rider overusing the whip or reins to make a horse alter its course.