Best Odds Guaranteed, usually shortened to BOG, is one of the most useful concessions available to horse racing punters.
Put simply, if you take an early price with a bookmaker offering BOG and your horse goes off at a bigger Starting Price, the bookmaker pays you at the bigger price.
That means you get the best of both worlds. If the early price you took is bigger than SP, you keep it. If the SP turns out to be bigger, you are paid at SP instead.
Over time, that can make a meaningful difference to your betting returns, especially if you regularly take prices early in the day.

