Jumping for Joy

Willie Joy buys a dog to make his girl happy; its a greyhound whose owner doesnt want it because its no good on the track anymore. He ends up being kicked out of his house and living with a punter in his train, who hatches an elaborate money making scheme. But in amongst this, Willies dog gets well again and he starts training it for the races, and he somehow ends up mixed up with a whole lot of crooked gangsters and a dog doping ring!