if you get a bull x out of a top line and ask it work single handed on quary till the end...... its a world away from pet staff or staff`s and it`s down to you to know your dogs and once that line has been crossed there is no going back ....how many time you seen to dog have a bit of a scuffle and then one dog backs down and the other dog just walks away that because the have never been asked to finish..... i think this what alot of people dont get when comparing Pet dogs to working dogs j m o p and atb x38