And yet that's how the fen dog was created, by adding saluki blood to the lurcher, to increase stamina and drive.......and that's how the lines of coursing greyhound were created, by Lord Orford adding bull blood to what they had then to "fire it up" a bit.
In fact that's how all lurchers were originally created, by adding something to running dogs to alleviate perceived faults in a dog that was otherwise OK.
The main thing as I see it is to make sure the blood you add is tested at what it does.
When you talk about fen dogs or lord Orfords Greyhounds, Pit bull terriers,Bull greyhounds,c