The Royal New Zealand Society for the Prevention of Cruelty to Animals has taken a step towards unification.
There are currently 46 separate SPCAs in New Zealand, each with a chief executive or manager and board.
At a conference in Wellington today delegates of the animal welfare organisation agreed to explore a proposal that would create one legal entity.
"The change is being driven by a desire to act in a more unified way so we can better help our most vulnerable animals," RNZSPCA chief executive Ric Odom says.
"By working together, we will have a stronger voice for the animals, be able to do more to prevent animal cruelty and ensure the best level of care for the animals in our shelters."
A national support office already exists that oversees the inspectorate and manages national fund raising campaigns.
SPCA delegates will vote on a detailed proposal at a meeting early next year. No changes will be made to the structure of the SPCA until this vote has passed.