Why decades of efforts to control free-ranging dog populations have largely failed
In short: More than 70% of the world's dogs are free-ranging, living outside human homes. While these animals are central to rabies transmission and public health, attempts to manage their numbers through sterilization or culling have historically struggled. New modeling suggests that current strategies often lack the scale required for success.
Free-ranging dogs (FRD) represent the majority of the global dog population, estimated at between 700 million and one billion individuals. These dogs are significant vectors for zoonotic diseases, including rabies, which causes an estimated 60,000 human deaths annually. In India, which hosts one of the world's largest FRD populations, the impact is severe, with approximately 20 million dog bite cases and 20,000 rabies-related deaths reported each year.
For over 200 years, various methods have been deployed to manage these populations, ranging from lethal culling to the modern Catch-Neuter-Vaccinate-Release (CNVR) program, also known as Animal Birth Control (ABC). Despite these efforts, population numbers have proven remarkably resilient. Research indicates that past culling programs failed because they lacked ancillary measures to restrict resource access, allowing populations to rebound. Similarly, modern ABC programs are often implemented without rigorous monitoring or sufficient scale, frequently targeting only urban centers without evaluating baseline population dynamics.
New agent-based modeling tools are now helping researchers understand why these interventions often fall short. Simulations suggest that achieving a significant, lasting reduction in FRD populations requires sustained, high-coverage efforts over long periods—potentially 13 to 18 years of continuous intervention at 85% coverage. In contrast, many current programs operate on the misconception that short-term bursts of surgery will lead to permanent eradication. By failing to parameterize models with real-world complexities like dog catchability and recruitment rates, authorities often set unrealistic targets, leaving the actual impact of their programs unmeasured and largely ineffective.
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Sources
- Summary by Intellect · source: Modelling the challenges of managing free-ranging dog populations - Scientific Reports
- Also: Free-ranging dog
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