Growing scientific evidence documents grief-like responses in companion animals following the loss of a bonded companion. Dogs show behavioural changes including reduced appetite, increased vocalisation, searching behaviour, and lethargy following loss of a bonded dog or human. A 2022 survey of 426 dog owners found 86% reported behavioural changes consistent with grief following loss of a canine companion. Cats show similar patterns - reduced grooming, increased clinginess or withdrawal, altered sleep patterns. The underlying neuroscience involves disruption of bonding neurochemistry (oxytocin, opioid systems). Welfare implications include the obligation to consider animal grief in euthanasia decisions (whether to allow the surviving animal to see the deceased body), rehoming timing, and introduction of new animals. Veterinary support for bereaved animals includes environmental enrichment, pheromone therapy, and monitoring for chronic stress indicators.