Hi simon , can only speak for my own dogs that is, and i have owned bull cross as well and seen some good bull crosser work , temperament wise as soft as arseholes with the family and i have 8 kids ,5 still at home ,people they dont no they are wary about and will grab but thats my doing, speed i would say is the same,depends on the cross 1/2 bred w/g same as 1/2 bred bull x, working style/ability , my dog or bitch will locate the terrier to ground why im still looking around, was digging at the side of a wood in a big place and i could not find bert for love or money big dog f**k off in to th