# What Is CNVR and Why Do Donors Fund It?

*KARACHI, PAKISTAN · JUN 27 2026*

> CNVR (Catch-Neuter-Vaccinate-Return) is the WHO-endorsed method for managing street dog populations: dogs are humanely caught, neutered, vaccinated against rabies, ear-notched and returned to their territory — stabilising populations and breaking rabies transmission without culling.

Catch-Neuter-Vaccinate-Return is the WHO-endorsed humane alternative to street dog culling. Here is what CNVR means, what it costs, and why UK donors fund it abroad.

## Key takeaways
- CNVR is endorsed by WHO, WOAH and FAO as the humane alternative to mass culling.
- Neutering stops breeding; vaccination builds herd immunity against rabies.
- Returned dogs hold their territory, preventing unvaccinated replacements (the vacuum effect).
- At scale over 3–5 years, CNVR reduces populations and dog-mediated human rabies deaths.
- UK donors fund partner-led CNVR in Pakistan through WARN's Karachi street dogs appeal.

## Briefing
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.

## FAQ
### What does CNVR stand for?
Catch-Neuter-Vaccinate-Return. Dogs are humanely caught, sterilised under anaesthetic, vaccinated against rabies, marked with an ear notch and returned to their territory.

### Why do donors fund CNVR instead of shelters?
Shelters cannot absorb city-scale street dog populations. CNVR stabilises the whole population — neutering stops breeding and vaccination breaks rabies chains — while shelters handle injured or non-releasable cases.

### Does CNVR work in Pakistan?
Pakistan reports an estimated 2,000–5,000 human rabies deaths per year. Periodic culls have failed to reduce numbers or stop rabies. CNVR is the evidence-based alternative WHO recommends.

### How much does one CNVR procedure cost?
A single catch-neuter-vaccinate-return typically costs roughly £50–£100 depending on location and clinic scale. WARN's Karachi appeal tiers start from £25 for vaccinating five dogs or £75 for one full CNVR procedure.

### Can UK donors fund CNVR abroad?
Yes. WARN welcomes UK supporters for partner-led CNVR in Pakistan. WARN cannot claim Gift Aid as it is not a registered charity, but gifts are receipted and directed to frontline clinics.

Human-readable page: https://worldanimalrescuenetwork.org/newsroom/what-is-cnvr-why-donors-fund-it