It is all about percentages, eg a whippet that has been bred from parents that were WCRA is 12.5% likely to become a champion. 7.5% if only one parent was WRCA and 2.5% if neither parents were champions.
If you want a dog to catch game, as long as it is 75% sighthound, you will be 50% there. The other 50% is down to the owner!
Good hunting!