You will find greyhound reload bonuses and promotions available at many online bookmakers but you can start by using the generic sign-up promotions if you have not already used them.  These range from money back offers if your bet loses or free bets when you deposit and bet a specified amount.  Either way, they are a good option to start greyhound betting.
The top online bookmakers for greyhound racing will have offers on races regularly and Paddy Power is a good example.  They usually offer a different special every week and it comes in the form of a money back special.  For example, if your dog finishes second to the favourite in a race, you will get your money back as a free bet.
This is just one of the many greyhound promotions runs by Paddy Power throughout the year.
Some online bookmakers will also offer a refund if your dog fails to start and BetVictor is a good example of a betting site which employs this promotion.  You can also find extra paid each way places during big greyhound meetings, so there are plenty of bonuses and promotions available when betting on greyhounds.