Jenny

A female donkey

Jockey Club

The Jockey Club is responsible for the day-to-day regulation of United Kingdom horse-racing. In conjunction with the British Horseracing Board and the Horserace Betting Levy Board, it is one of the three bodies which provide management for horse racing in the United Kingdom.

Jog

A Western term for a slow trot. Also European style of riding to describe a slow, shortened trot in which the rider usually sits rather than posts.

Jowl

The cheek bone under the horse's ear on both sides.