I don,t want terrier or whippet in the mix as it brings litter size down,over many generations,i don,t want bull in the mix as it takes far more away than it offers.The dog is 28" and about 80lb,it offers a tad more than a Whippety-Terrier ish lurcher,can run longer and with more reward than the average bull x and hunts as well as he connects,IF you have a Genuine bitch id expect to show the dog in flight,otherwise ive little to no interest.If your saying bull takes away more than it gives you have never seen the right bull imo.
If you want your dogs for hare coursing/rabbiting I understand