Animal shelters in the US euthanize an estimated 1.5 million dogs and cats annually, with significant welfare concerns about housing conditions, stress, and the decision frameworks governing euthanasia.
Shelter environments cause significant welfare harm through chronic stress from confinement, noise, unfamiliar social environments, and unpredictable human interaction. Animals held for extended periods show behavioral deterioration that is both a welfare indicator and an adoption barrier. Enrichment programs, foster care networks, and behavioral rehabilitation reduce stress and improve outcomes simultaneously. The euthanasia decision framework remains contested — animals euthanized for space pressure versus for welfare or safety reasons represent different ethical categories that shelter systems manage with varying transparency.