The standard dressage arena size is 20x60 meters (66’ x 198’) and is required for First Level Test 1 through Grand Prix, as well as upper level eventing. The small or short dressage arena size is 20x40 meters (66’ x 132’) and is used for lower level dressage and eventing tests. Premier dressage arenas can be easily converted into the small or standard sizes. Upgraded sizes are available too!