In a jurisdiction with a strict liability regime for dog attacks, a man owns a trained attack dog and rents it out to others for use in their security businesses. One day, the dog is rented by a security company and escapes from the company's premises, attacking and injuring a pedestrian. Who is liable for the pedestrian's injuries: the man who owns the dog, the security company that rented the dog, or both? And under what legal theory or theories?