Let’s start with the easy part: PetRescue is strongly in favour of desexing. Every dog and cat that’s desexed is one less litter of puppies or kittens needing somewhere to go, and desexing is one of the simplest, most effective things a guardian can do for their pet and their community.
So, when governments propose laws that make desexing compulsory, it can feel like an obvious win. More desexed pets, fewer animals in shelters, right?
The evidence tells a different story.
A law doesn’t fix a barrier
Across Australia, states and councils that have tried mandatory desexing, cat registration or containment laws haven’t seen the population reductions or shelter intake reductions they were hoping for. The Australian Veterinary Association has stated that mandatory desexing hasn’t been shown to meaningfully reduce the number of unwanted dogs and cats, and Dogs Victoria’s position points to the same conclusion for dogs.
Why? Because most guardians and carers already want to desex their animals. The people who don’t aren’t necessarily being careless. They may be facing a real barrier: cost, transport, time off work, or simply not knowing that low-cost options exist.
A law doesn’t remove any of those barriers. It just makes it illegal not to have already overcome them.
Cats and dogs, different problems
For cats, the picture is even more complex. Many cats that end up in council pounds and shelters were never anyone’s pet to begin with. They’re urban stray cats, cared for informally by neighbours who feed them but don’t consider themselves their owners.
A law aimed at addressing “irresponsible ownership” doesn’t reach this group. In some places, it can even create barriers for people who are trying to help. Someone caring for an urban stray cat may not be able to have the cat desexed or microchipped without first taking on legal ownership, yet the law may offer no clear pathway for them to do that.
So the very people willing to step up and help can find themselves constrained by the same rules intended to encourage responsible pet ownership.
For dogs, the picture is different again. Most dogs that come into shelters aren’t there because they weren’t desexed. They’re there because of housing changes, financial hardship, or a mismatch between the dog and the household. Mandatory desexing doesn’t address any of those causes.
What actually works
The good news is that we do know what can make a difference: making desexing easier to access.
Targeted, free or very low-cost desexing programs in areas with high numbers of undesexed pets and urban stray cats have delivered real results. Banyule City Council’s free cat desexing program, profiled here, removed cost and ownership barriers for guardians and cat carers and saw a dramatic fall in both cat intake and euthanasia over several years.
Bendigo Animal Relief Centre’s Community Cat Program, covered here, followed a similar model and has already seen a sizeable drop in stray kitten numbers.
These programs work because they remove the barrier instead of penalising people for not having overcome it.
The unintended consequences
There’s another outcome that mandatory desexing laws can risk: more animals entering or remaining in council and shelter care, without a corresponding reduction in the wider population.
When laws criminalise the care of undesexed urban stray cats, for example, these cats can become targets for impoundment rather than receiving the support they need. And the strays that remain can continue to breed, particularly where food and shelter are available.
That’s a worse outcome for cats and for the people who care about them, without addressing the underlying cause of the problem.
One size doesn’t fit all pets, either
There’s also a health dimension. For some dogs, particularly certain breeds and large or giant breeds, the timing of desexing can affect their risk of joint problems and some cancers.
That’s why the decision about when to desex should sit with a guardian and their vet, weighing up the individual dog, rather than being dictated by a blanket legal deadline that applies to every dog regardless of breed or size.
What we’d rather see
Instead of mandates, PetRescue backs the approaches with evidence behind them: accessible, free or low-cost desexing where it’s needed most, support for people caring for urban stray cats to get them desexed, and trust in guardians and vets to make the right call for each individual pet.
It’s less punchy as a headline than “just make it the law”, but it’s what actually helps more pets get desexed and can help prevent more animals from entering shelters in the first place.
Image: Umber adopted thanks to Animal Welfare League of QLD Warra.