Existing rules by the Jockey Club prohibited owners, trainers and stable employees from laying horses in their ownership or care to lose. This rule has now been extended to those who provide a service to a trainer, such as veterinarians.

The form of betting - on a horse to lose - is made possible at "betting exchanges", which exist in the UK and Ireland. The betting on horses to lose has led to controversie because it leads to a risk of corruption of races, as one can always make a horse lose and never be sure to make it win.