Yep. This business is screwed! Reminds me of a story several years back in Denver where a man's business kept getting robbed at night. He hooked up a shotgun with a tripwire adjacent to the window that was constantly being entered through. Guess what happened? Burglar forced his way in and found himself dead. His family was outraged, "Burglary doesn't carry a death sentence!!!" were their screams. The cops took the side of the grieving family.
The business owner should claim that maybe the guy jumped the fence to torment the dogs. Hmmmm. How do we know? Maybe the dogs were just chewing in self defense.