Small mustelids — stoats, weasels, and polecats — are important native predators whose welfare is affected by trapping, habitat loss, and road mortality. Their conservation status varies significantly across the group.
Small mustelid welfare is affected by both direct trapping and habitat-level food supply changes. Stoats and weasels in areas of intensive game management face high trapping mortality. The welfare of individuals caught in spring traps but not killed instantly is poorly documented — trap design has improved but instant kill cannot be guaranteed in all settings. The recovery of polecats has been one of British wildlife conservation most successful stories, driven by reduced persecution and habitat improvement. Ensuring that spring trap welfare standards are enforced and that non-target species including water voles are not taken is an ongoing challenge.