Sorry – I initially made a typo…By-law changes are not retrospective. I have corrected the typo.
If your Real Estate Agent and/or Owner of your Lot did not obtain approval then I would request that they send a letter IMMEDIATELY to the OC seeking approval. Ask that the Real Estate Agent and/or the Owner base the approval on the information that you have provided in your initial comment. Clearly state that the owner has provided approval.
By-law changes are a two step process. Step (1) OC votes to change the By-law at a General Meeting. Step (2) The new or changed By-laws are Registered.
The important date is the date of Registration.
By-laws do not become legally enforceable until they are Registered with the Registrar General, NSW Land Registry Services. Until that date the previous By-laws apply.
The OC must act reasonably. Therefore, your OC cannot reasonably deny your ability to keep a pet before the date that the anti pet By-law is Registered.
Get your letter in ASAP.