Neutering
What is TNR, and why do we do it?
People sometimes ask why we neuter a cat and put it back outside instead of finding it a home. It is a fair question, and the honest answer is not a comfortable one. There are more cats than there are good homes, and for a lot of these cats, going back is the kinder outcome.
What is a community cat?
Not every cat living outdoors is the same, and the difference decides what happens next.
A stray goes into foster care and gets rehomed. A feral cat is a different animal altogether. Putting a truly feral adult in a living room does not produce a grateful pet. It produces a terrified animal hiding behind a sofa for months, and the stress of it makes them ill.
So what actually happens?
Trap, neuter, return. It is exactly what it sounds like, and it is the method used by Cats Protection, the RSPCA and just about every serious cat charity in the country.
- TrapHumane traps, set where the cats already feed, watched the whole time. Nobody grabs a cat by hand.
- Vet check and neuterEvery cat is neutered, checked over, treated for fleas and worms, and any obvious problems are dealt with.
- Ear tipA small piece of one ear is removed flat while the cat is under anaesthetic. It does not hurt them and it does not grow back. It is how everyone can see from a distance that this cat is already done, so nobody traps and operates on them twice.
- ReturnBack to the exact place they were trapped, once they have recovered. That is their territory and they know it.
- Keep an eyeSomeone locally keeps feeding them, watches for new arrivals, and rings us when a new unneutered cat turns up.
Friendly cats and young kittens found in the middle of a colony are taken out of it and rehomed. Kittens caught early enough can be socialised and go on to be ordinary pets. That part matters, and we will always do it where we can.
Why not just rehome them all?
Here is the position, with the numbers behind it.
The estimated number of unowned cats living in the UK's towns and cities. That figure comes from research by Cats Protection published in the journal Scientific Reports in 2021, and Bradford was one of only five places in the country the study was based on.
The share of the variation in unowned cat numbers that the same study put down to socioeconomic deprivation. More than anything else, it predicted where the cats were. That is precisely why our work is concentrated where it is.
Unowned cats passing through UK shelters every year, according to figures cited in that research. Rescue space is not an infinite resource, and it is already full.
Owned cats in the UK that are still not neutered, according to Cats Protection's 2025 annual report, with neutering rates falling rather than rising. Every one of those is a potential litter that ends up somewhere.
Put those together and you have the honest answer to why we do not simply rehome every cat we find. In an ideal world every one of them would get a sofa and a name. We would love that. But there are more cats than there are homes, the shelters are full, and the number keeps growing while people are struggling to afford neutering.
Sometimes the only thing we can do is stop the problem getting bigger. That is not giving up on those cats. It is the most useful thing anybody can do to stop the next generation meeting the same fate.
Does it actually work?
TNR is not just kinder, it works, and there is decent evidence for it.
- A long running programme at the University of Central Florida recorded a 66 per cent fall in cat numbers, and when the same site was looked at again 17 years later the population was down 85 per cent, with 11 of its 16 colonies gone entirely.
- A study of 20 colonies in one Chicago neighbourhood found average reductions of 54 per cent from when colonies were first recorded, and 82 per cent from their peak. Eight of the 20 colonies disappeared completely.
- Across these studies the pattern is the same: numbers fall steadily rather than overnight, and they stay down as long as the work is kept up.
Two honest caveats, because we would rather you trusted us than were impressed by us. Part of the reduction in those studies came from friendly cats and kittens being adopted out, not from neutering alone. And TNR only works if enough of the colony is done, and it is kept up. Neuter half a colony and walk away and you have achieved very little. That is why we ask people to tell us about a colony early, when it is six cats rather than twenty.
Why not just remove them?
The obvious alternative people suggest is removing the cats. It sounds decisive and it does not work, for a simple reason.
A colony exists where it does because there is food and shelter there. Take the cats away and the food and shelter are still there, so other unneutered cats move in and start breeding. You are back where you started within a year, except the cats you removed are dead or occupying rescue spaces that were needed for cats that could actually be rehomed.
Neutered cats hold their territory without producing kittens. The colony ages, shrinks, and eventually goes.
The other question we get asked constantly is why we do not just find them a stable or a farm out in the country. It is a fair thought, and we do exactly that when we have to. If a cat cannot safely go back, because the site is dangerous or because there is nobody there to feed them and keep an eye on them, we look for a rural home.
But it is a last resort rather than a first choice, for two reasons.
A cat moved to a new place has to be shut in, usually crated or confined to a stable or outbuilding, for several weeks, so that it learns where home is. If you release a cat straight out it will simply try to walk back to where it came from. For a friendly cat that confinement is dull. For a genuinely feral cat it is weeks of real distress, shut in a small space by people it is terrified of.
And there are nowhere near enough of these homes. Stables and smallholdings that want working cats are in short supply and everybody is asking for them. As with everything else here, there are far more cats than there are places for them to go.
What TNR does for the cats
It is also worth saying what changes for the cats themselves. Neutered toms stop fighting over mates, which is how FIV spreads and how abscesses happen. Females stop having litter after litter, which is exhausting and dangerous. The calling, the spraying and the fighting that make neighbours complain all reduce. Cats in managed colonies are in visibly better condition than cats in unmanaged ones.
What we do in Bradford
We are a small volunteer run rescue and we cannot be everywhere. What we can do is TNR in the areas where the need is highest, support people who cannot afford to neuter their own cats, and get to colonies before they get out of hand.
If you know of a group of cats in Bradford that is growing, or you are feeding cats you did not ask for, please tell us. You are not in trouble and we are not going to take them all away. We will come and look, tell you honestly what we think, and work out a plan with you.
Know of a colony?
Tell us where it is and roughly how many cats there are. Early is much easier than late.
Sources
- McDonald, J.L. and Skillings, E. (2021). Human influences shape the first spatially explicit national estimate of urban unowned cat abundance. Scientific Reports, 11, 20216. nature.com/articles/s41598-021-99298-6. The source of the 247,429 estimate, the 31% deprivation finding, the density of 9.3 unowned cats per square kilometre, and the shelter intake figure. Bradford was one of the five study areas.
- Cats Protection (2025). Annual Report. cats.org.uk. Neutering rates and the number of unneutered owned cats in the UK.
- Levy, J.K., Gale, D.W. and Gale, L.A. (2003). Evaluation of the effect of a long term trap neuter return and adoption program on a free roaming cat population. Journal of the American Veterinary Medical Association, 222(1), pp.42 to 46. A 66% decline over the study period at the University of Central Florida.
- Spehar, D.D. and Wolf, P.J. (2019). Back to School: An Updated Evaluation of the Effectiveness of a Long Term Trap Neuter Return Program on a University's Free Roaming Cat Population. Animals, 9(10), 768. An 85% decline over 28 years at the same site, with 11 of 16 colonies gone.
- Spehar, D.D. and Wolf, P.J. (2018). A Case Study in Citizen Science: The Effectiveness of a Trap Neuter Return Program in a Chicago Neighborhood. Animals, 8(1), 14. Mean colony declines of 54% from entry and 82% from peak, with 8 of 20 colonies eliminated.
Figures are quoted as published at the time of writing. Where we have given a range or an estimate, that is because the underlying research does too.