Legal Question in Civil Litigation in Pennsylvania

You could be liable under theory of "let the superior answer" if the breach of duty (to close the gate) was in your employee's job responsibilities. That said even if your employee left open the gate the dog owner would have to show that the gate being open was the cause of the damages. Further, what sort of injuries the dog had may affect the outcome. If the dog suffered injuries because it was shot on someone else's property the shooter could have liability as well.

As you can see it's a lot more complicated than you think.

{John}