When comparing the best US horse and greyhound betting sites, it’s always wise to pay close attention to what kind of bonuses each operator is offering to new or first-time customers. OffTrack Betting has a pretty amazing cash back rewards program in place for existing bettors, but its new customer bonuses rotate pretty regularly and might not always be well suited to your online betting tastes. Compare OffTrack’s latest offers with the best online gambling bonuses now with GamblingGuy.