Free-living urban cats occupy a contested welfare and conservation space, with advocates disagreeing sharply on the ethics and effectiveness of management approaches.
Free-living urban cats experience chronic welfare challenges: vehicle strikes, dog attacks, infectious disease, parasites, and extreme weather. Their average lifespan is 2-5 years versus 12-18 years for indoor cats. They also impose welfare costs on billions of individual wildlife animals. TNR programs improve the welfare of individual cats in managed colonies, but evidence for population reduction is mixed without near-total coverage. The ethical tension between the welfare of individual cats and the welfare of wildlife populations they prey upon has no simple resolution.