How To Lay Greyhounds To Lose And Pick Up A Profit From The Betting Exchanges by Tim Fulcher www,winningratings.com. Laying greyhounds to lose is quite an easy method of making a profit from the betting exchanges. All that you need to do is to back a dog to lose, and if you chose the right ones then you will end up with only about 5-10% winners. This can give you a nice profit from a betting exchange, where you pick up the other guys stake