Your Legal Obligations
All animals must be kept in such a way that it does not compromise the 5 freedoms of welfare.
What are the Five Freedoms of animal welfare? – RSPCA Knowledgebase
The Cat Act was updated in 2011. Essentially all cats need to be sterilised, microchipped and registered with the local council by 6 months of age. Exceptions apply. See the Act for the details.
Laws for responsible cat owners | DLGSC
The 1976 Dog Act was updated in 2021. Essentially all dogs need to be sterilised by 2 years of age. They also should be registered with the local Council and microchipped by 3 months of age. These amendments are not yet being enforced but all dog owners should be aware. See the Act and Amendment for details.
Dog Act 1976 - [06-e0-02].pdf (legislation.wa.gov.au)
In Western Australia there are mandatory livestock identification and movement laws. If you own livestock then you need to obtain a PIC number to use when moving stock from place to place and in disease outbreak investigations by the Ag Department. See below.
Livestock ownership, identification and movement in Western Australia | Agriculture and Food