The Science Behind TNVR: Why It Works When Culling Doesn’t

Walk through a neighborhood or market in Myanmar, and you may see dogs resting near food stalls, sleeping beside monasteries, or following people who feed them. Some have families. Others are cared for by an entire community. Many have no one person responsible for their veterinary care.

For those of us who have never faced a street-dog crisis on this scale, the obvious solution may seem to be shelters and adoption. But in Myanmar, there are far more dogs than available homes, shelters, veterinarians, and public resources.

The crisis begins with something simple: too many puppies are being born.

How the Crisis Continues

When sterilization is not available, one female dog can produce multiple litters. Her surviving puppies eventually reproduce too. Many puppies die from disease, hunger, traffic injuries, or lack of care. Those that survive continue the cycle.

Food scraps and open garbage allow large dog populations to remain in an area. Removing the dogs does not remove these resources—and it does not prevent the next litter from being born.

Shelters and adoption can transform individual lives, especially for puppies, injured dogs, and former pets. But they cannot accommodate every free-roaming dog. Large shelters require land, trained staff, food, medicine, sanitation, and permanent funding.

A population-wide crisis requires a population-wide solution.

Why Culling Doesn’t Work

Culling may make the streets appear emptier for a short time, but it leaves the causes of overpopulation untouched.

The dogs that remain continue breeding. New dogs may move into the newly available territory. Before long, the population begins to grow again, and the killing is repeated.

Culling can also remove vaccinated dogs, weakening efforts to prevent rabies—a serious public-health concern in Myanmar.

Both the World Health Organization and the World Organisation for Animal Health recognize that mass culling is ineffective and may be counterproductive. Their guidance supports vaccination and humane, sustained dog-population management.

How TNVR Breaks the Cycle

TNVR stands for Trap, Neuter, Vaccinate, and Return.

Dogs are humanely captured, sterilized, vaccinated, treated for immediate health problems, and returned to their familiar communities.

Once returned, they continue occupying their territories—but they no longer produce puppies. Vaccination protects the dogs and the people living around them. Over time, fewer births create a healthier, more stable population that can gradually decline without mass killing.

TNVR is not a one-day solution. It works best when clinics return to the same communities, reach a meaningful number of dogs, and combine sterilization with vaccination, education, and local veterinary training.

What Your Support Makes Possible

Every TNVR clinic means more than a day of surgeries.

It means fewer puppies born into hunger and disease. It means more dogs protected from rabies. It means safer communities and local veterinary professionals gaining the skills and equipment to continue this work.

At Let’s Save the Strays International, our goal is not simply to remove dogs from sight. It is to stop suffering before it begins and create lasting change—one dog, one community, and one prevented litter at a time.