Rochard owns and operates a drug store. Because business is often slow during the day, and because he worries about robberies, Rochard regularly brings his dog, Sid, to work with him. Sid has been a bit of a mixed blessing over the years. He has provided good companionship and his aggressive nature has discouraged teenagers from hanging around the store. At the same time, Sid has occasionally frightened customers and on a couple of occasions he has tried to bite small children. Rochard's luck recently ran out when Sid did, in fact, attack and severely injure Sarah, a young girl who was visiting the store with her father. Although Rochard feels very sorry for Sarah, he denies that he is responsible for her medical bills. As he correctly points out, he did not intentionally cause Sid to attack Sarah. On the contrary, he took every reasonable precaution to prevent the incident from occurring. Rochard therefore insists that he cannot be held liable in tort. Is he correct? Explain your answer.