Blinkers

A hood worn on a horse’s head to limit side vision, which can improve concentration. Blinkers are added or removed to relax a horse or give it more focus.

Exacta

A bet selecting the first and second horses in a race in the correct order. An exacta box refers to paying a little more to ensure they can finish in either order.

Scratch

A horse is a scratch when injury or other necessity causes it to be withdrawn from the race.