My uncle used to race dogs ages ago..he told me he used to stick deep heat in the dogs butt....made them run like there was no tomorrow.....guess they just wanted it out...funny thing it was not against the rules RSPCA don't take tio kindly..tried to charge him with cruelty to animals...he beat them in court by telling the judge they had straind there calf muscle and thats what he was using to fix it...lol