9feeba01__RSPCA_Australia_knowledgebase__Relevant_Provision
[State] New South Wales [Legal? (Yes/No)] No [Relevant Provision] 
Section 12 of the Prevention of Cruelty to Animals Act 1979 (NSW) provides that a person shall not dock the tail of a dog. However, if the person who docked the dog’s tail was a veterinary practitioner and was docking the tail in the interests of the dog’s welfare, then the person is not guilty of an offence under section 12.
Is the tail docking of dogs legal? - RSPCA Australia knowledgebase
Relevant Provision