good answer there, the thing with coursing dogs as a whole, they have evolved into different types to suit different land, some men like the steady type, 5/6 minuets, others like a faster more aggressive style, and have bred for these traits, so if you want to add to a fast lurcher type, don't use a fen dog, the lines do matter so look for lines that produce what suits you, and your stye of running dog don't trust luck.