Sophie is walking her boyfriend's large pit bull breed dog. Before leaving the house, her boyfriend advised Sophie to "Keep a good grip on him because he can be wild". When she is out walking Sophie passes a man. The dog jumps at the man biting him on the leg. Sophie denies responsibility because it isn't her dog.

Applying the rules of interpretation, interpret the relevant statutory provisions of the Dangerous Dogs Act 1991 to decide whether Sophie is liable for the dog biting the man?