i don't condone theft but that yard owner with the dogs was leaving himself wide open to charges and claims had anybody been attacked by these dogs even if the dogs are inside and they break in and get savaged the owner is responsible daft i know but that is the view of the police and the courts and who says crime does not pay 
These dogs are well trained. They are trained like police dogs to hold an intruder, not to attack them. But they dont need to, because the need doesnt arise, big black and tan dogs are the ONLY thing the worst characters at the travellers site were put off by.
The point of them being there is that they are actually family pets, but also that their presence means the livery and scaffold businesses are still running, which given the record of the 'site' which includes armed robbery, assault, theft, arson and I could go on, is purely and solely because of the dogs.
In any case the dogs are patrolling both the house/garden and the scaffold yard, it is part of the 'garden' :-))) It is very clear they are there, so a thief couldnt break in unawares as they might in a warehouse.
They might be done for possessing a 'dangerous' dog but I think they take the view that for that to happen, something serious would have taken place and at least their family would still be alive and not have a torched house/business.