The horse racing betting bonuses are presented as cash offers. In general they are one time welcome offers for real money deposits. The most popular offers are deposit match up to 100%. However, there are many different deals with different size of deposit reload.
To understand each offer is good to read the full terms and see an example. On this way you can be sure that you will get what you see. Terms and conditions apply to each bonus so it's highly recommended to read them in depth, just to be sure what's the full deal.
Here you can see real offers that you can use right now to add extra cash on top of your money and bet or play more.