1892 New Police Act includes animal protection laws for "... any beast, bird, reptile, fish, or other living creature, or any egg or spawn thereof.", and "... any native or acclimatised animals or birds which may be on any park or public road or reserve...".

The first legislation is adopted to protect sea lions and other pinipeds from slaughter for pelts.

1912 First Prevention of Cruelty to Animals Act adopted by Parliament.

1920 Prevention of Cruelty to Animals Act 1920 - maximum penalty for an offence was $200 and one year imprisonment.

Powers of inspection and prosecution were conferred upon officers appointed by The Society and special constables appointed by the Court. The Royal Society for the Prevention of Cruelty to Animals Kalgoorlie was also named in the Act, but has since closed. 

(RSPCA WA once again has an Inspector in Kalgoorlie.)

1976 The Dog Act (WA) introduced to amend and consolidate the law relating to the control and registration of dog ownership.

2002 Animal Welfare Act 2002 replaced the Prevention of Cruelty to Animals Act 1920. The maximum penalty increased to $50,000 and two years imprisonment for individuals, and $250,000 for corporations.

2011 Cat Act 2011 came into full effect 1 November 2013, and includes compulsory microchipping, registration and sterlisation.

2019 RSPCA WA worked with the WA Government to promote public submissions to amendments to the Dog Act and Cat Act, and into Draft Standards and Guidelines for the Health and Welfare of Dogs in WA. RSPCA WA has also made a submission to the review of the Animal Welfare Act 2002