Dog Act 1976.

The Act provides for the discipline of the registration and identification of dogs, the ownership and keeping of dogs. It also encompasses the obligations and rights of persons in relation to owning and keeping dogs and for consequences of damages and injuries caused by dogs.
Part VI, Division 2, disciplines control of dangerous dogs Division 3 provides actions to protect livestock. A person who owns, or who is for the time being lawfully in charge of, any animal or bird may lawfully shoot or otherwise destroy a dog which he finds attacking that animal or bird if there is no other way of stopping the attack and provided that notice is given to a police officer as soon as is practicable thereafter. The owner or occupier of any enclosed paddock, field, yard or other place in which any horse, cattle, sheep, swine, goats or poultry (in this section referred to as livestock) are confined, may lawfully shoot or otherwise destroy any dog found therein, whether the owner of the dog is or is not known, if that dog is not accompanied by some person. Where it is reasonably necessary for the protection of livestock confined or depasturing on any land the owner or occupier of that land or a person acting under his authority may lay poison on that land in baits likely to be taken by dogs wandering at large if the poison is not laid close to any road, reserve or public place; the laying of that poison is authorised in the material circumstances by or under any Act relating to the prevention, destruction or eradication of specific kinds of animal or of animals in specified circumstances; and (c) the poison is not so laid as to endanger children or indigenous birds or animals.