he missed collie out mate !! it is hard todo really because you say sire is a 3/8/5/8 bull grey x collie bull grey so to work out % of ur pup you would need to know the collie bull grey cross of sire is that a colli grey cross bull grey is it 5/8 grey 3/8 collie ?????? who really knows. what i would say is you should have urself a nice lurcher !!!!!!!!! lurcher being the word lol