Pulling a SULKY is an activity that involves harnessing a horse to a small cart or carriage. The horse then pulls the cart or carriage, usually with one or two people inside. The term 'pull a SULKY' comes from the Irish word 'SULKY, ' which means 'a light two-wheeled vehicle.' Trotting is a type of gait used by horses when they are pulling a SULKY. It is a two-beat diagonal gait in which the horse moves its legs in diagonal pairs. Trotting is a faster gait than walking, but slower than galloping.