Animals form strong social bonds and show clear behavioral responses to the loss of companions; recognizing and supporting grief in pets improves their welfare during difficult transitions.
Animal grief remains incompletely understood but is increasingly recognized as a genuine welfare concern rather than anthropomorphic projection. The behavioral changes documented in companion animals after losing bonded companions — appetite loss, searching, altered social behavior, lethargy — are consistent with what we would expect from animals experiencing distress at the loss of an important social partner. Dismissing these responses as "just behavior" ignores the welfare reality of the animal experience. Supporting grieving companion animals through consistent routines, extra social engagement, environmental stability, and veterinary monitoring for health impacts provides meaningful welfare benefit during a difficult period. The consideration of whether to get a new companion animal — and when — involves balancing the welfare of the grieving animal with the introduction of an unknown social dynamic.