The Kings own a store in a crime-ridden section of town. As victims of break-ins

The Kings own a store in a crime-ridden section of town. As victims of break-ins in the past, they buy a guard dog to protect their store. The dog is trained to attack on command. It also stays in the store from 11 P.M. to 7 A.M. while the store is closed. One night, a man breaks into the store and is attacked by the dog. The man is caught and convicted of burglary. After the judge gives him a suspended sentence, the burglar sues the Kings for the injuries caused by the dog. How would you decide this case?