This article notes that you must be very careful with burglars attacking your guard dogs.
I detest animal abuse, and this poor guard dog received a serious injury by some scumbag intruder who inflicted a nasty gash above this dog’s eye:
Guard dogs can be abused when confronting intruders
Eventually they did find the person who abused this guard dog, dead as a doornail:
In this case the abuser escaped a criminal conviction, but at least the poor dog got some satisfaction, as it appears that his entire face was eaten. . . .