CNVR — Catch-Neuter-Vaccinate-Return — is the internationally endorsed method for managing free-roaming dog populations humanely. It is the answer when someone asks how to help street dogs without mass killing, and it is the programme UK donors fund when they support WARN's Karachi street dogs appeal.
What CNVR involves
- Catch — Dogs are humanely caught using soft nets and trained handlers.
- Neuter — Sterilisation surgery under anaesthetic prevents further litters.
- Vaccinate — Every dog receives a rabies jab, building the herd immunity WHO says is needed to stop human deaths.
- Return — Dogs are ear-notched for identification and returned to their territory, where they remain familiar community guardians.
Why donors fund CNVR
Pakistan holds an estimated 20 million free-roaming dogs and reports among Asia's highest human rabies death tolls. Mass culling removes visible dogs but does not reduce breeding or vaccinate replacements — the vacuum effect fills vacated territories with unvaccinated animals within weeks. CNVR breaks that cycle.
Cities including Jaipur, Chennai and Bali have shown what sustained CNVR achieves: stabilised populations and eliminated dog-mediated rabies. The model works when funding and political will hold steady — which is exactly what donor gifts to partner clinics provide.
Where to give
Read the full Karachi street dogs appeal, the rescue guide street dog rescue in Pakistan, or help dogs in Karachi. Donate to fund CNVR clinic days, or explore symbolic dog adoption from £5/month.
Help the rescue dogs WARN is being built for
WARN's launch programme in Karachi will fund partner dog rescues and the animal shelter capacity they urgently need — humane catch-neuter-vaccinate-return work, veterinary care for injured street dogs, and responsible in-country adoption of rescue dogs into safe Pakistani homes.
Read the Karachi street dogs appeal for the full plan, or donate today to fund our first surgeries, vaccinations and shelter weeks. Every pound helps another rescue dog get a fair start.
When is CNVR the wrong tool?
CNVR is for free-roaming community dogs. It is not a rehoming pipeline, not a UK kennel plan, and not a reason to skip rabies vaccine before you travel.
Injured, aggressive or non-releasable dogs still need shelter beds. CNVR is the street-scale tool; clinics and kennels are the exception tool. Mixing them up is how cities build pounds and still have rabies.
If you want a named dog in a pen, a local shelter sponsorship is the product. WARN’s dog gift is pooled camps — /sponsor/dog/.
What does WARN actually fund in Karachi?
Partner-led catch-neuter-vaccinate-return and rabies vaccination, not a WARN-owned hospital. Pakistan is the in-network focus. Culls have not stopped the deaths.
Published working figures already on the Karachi appeal: £75 helps fund one full CNVR pathway; about £3.25 is the all-in vaccination equivalent we use so we do not overstate dogs-per-pound. Field costs move with fuel, security and drugs, so we round impact down.
WHO’s coverage target is about 70% of the dog population, repeated. That is why monthly gifts matter more than a single heroic weekend. Returned, ear-notched dogs hold territory so unvaccinated replacements do not flood in — the vacuum effect is the whole argument against culling.
Jaipur, Chennai and Bali are the comparison cities in the literature, not WARN field offices. We cite them as evidence that the method works when funding holds, not as places we claim to run.
Karachi’s street population is not a kennel waiting list. Estimates for the city run from tens of thousands to hundreds of thousands depending on ward and season; Pakistan as a whole is often put near 20 million free-roaming dogs. What changes rabies risk is coverage, not a headline headcount. That is why the appeal buys clinic days and vaccine, and why the monthly dog guide exists — so the same streets get a second and third round instead of a single photogenic Saturday.
Which CNVR claims should you challenge?
One-camp miracles, named-dog theatre, and “cull plus vaccine” hybrids.
- One weekend will finish rabies. Coverage has to be rebuilt as puppies are born. That is a multi-year budget. Monthly sponsorship exists for that reason.
- CNVR without return. If dogs are not returned to the same streets, you have catch-and-remove, which recreates the vacuum.
- Vaccine-only with culling. Killing the vaccinated population wastes the coverage you just paid for.
- Gift Aid on the jab. Legal identity: /about/registration-status/.
Where do you check out?
Monthly on the dog sponsor guide. One-off clinic days on the Karachi appeal. Symbolic-adoption language on /adopt/dog/.
Sponsor a dog. Karachi appeal. Help street dogs abroad. Culling briefing.
