Yes dog has bull in.him but just had the bull on the yard and crossed them over..some lads will disagree with it but I myself dont see any harm in the cross as it'll either work or it wont..plus I don't have as many terriers as I should and the bitches on my yard are by no means tested or tried and I wouldn't bred off them til I know what they are..so experiment to pass away time see what comes of it cork man