Brooklyn Handicap
As a gelding, Exterminator competed in 99 races, winning 50 while finishing second and third 17 times each. His lifetime earnings amounted to $252,996. Beaten in the Brooklyn Handicap by Grey Lag once, Exterminator got better as he got older and later defeated Grey Lag in the same race. Following the retirement of trainer Henry McDaniel, in 1921 Willie Knapp took over as trainer of Exterminator and won five stakes races with the horse.