The greyhound "grading" system, instituted in 1946, provided a method for more accurate handicapping, resulting in increased handle. Greyhound would start in Grade "M" (maiden, no wins) though some tracks would employ a Grade "E", Wonderland did not, dogs winning a maiden race being placed in Grade D. If successful, dogs could progress possibly improving to Grade AA, or move up and down the grading system at various levels until retiring or being dropped as uncompetitive. "Schooling" [non-betting] races were held prior to the evening performances, and schooling race information would be included in the racing program once a greyhound's racing career began. Generally the racing program would carry information regarding either the last 8 or 10 races; other publications (such as the "Tel-Mor Book" would carry lifetime performance information and be available at additional cost). Greyhounds which did not finish fourth or better in any three consecutive races were dropped a grade, to improve the competitive nature of the racing. For the evening programs, a single Grade AA race was run. This race, known as "The Hot Box" was for the finest greyhounds racing at the meet. Generally all greyhounds racing at the meet would race exclusively at Wonderland, after running at various tracks in Florida during the winter months. For many years greyhounds were imported into the United States and raced at Wonderland after racing in Ireland (and sometime England). Several breeders specialized in raising dogs in Ireland and training them at Irish tracks prior to importing them to the US.