Grafter man im speaking for myself in relation to the one i have at in kennells.He is a straightx staffxpatt and for your first question he will find and has found anywhere i have put him,and he has been in some big places.I dont see how bull blood would hinder him as i think and this is my opinion,that staff's have a really good nose on em,they will hunt like any other terrier on top if brought up correctly.I find they enter very easily with a will to do the job they were bred for.Size wise,again im speaking for myself,the one i have is smaller than any of the black dogs i keep,and smaller t