Companion Animals Act 1998 No 87
Current version for 5 December 2019 to date (accessed 2 June 2020 at 06:12)
Part 3 Division 1 Section 17
17   Dog must not be encouraged to attack
(1)  A person who sets on or urges a dog (other than a dangerous, menacing or restricted dog) to attack, bite, harass or chase any person or animal (other than vermin) is guilty of an offence, whether or not actual injury is caused.
Maximum penalty—200 penalty units.
(1A)  A person who sets on or urges a dangerous, menacing or restricted dog to attack, bite, harass or chase any person or animal (other than vermin) is guilty of an offence, whether or not actual injury is caused.
Maximum penalty—700 penalty units or imprisonment for 5 years, or both.
Note.
 If the dog is a dangerous, menacing or restricted dog, conviction for an offence under this section results in permanent disqualification from owning a dog or from being in charge of a dog in a public place. See section 23.
(2)  This section does not apply to something done by a person—
(a)  in the reasonable defence of a person or property,
(b)  in the proper performance of the person’s duties as a police officer or correctional officer (within the meaning of the Crimes (Administration of Sentences) Act 1999),
(c)  in the course of the use of a dog for the working of stock or the training of a dog in the working of stock,
(d)  in the course of lawful hunting.