Animals including dogs, cats, and horses show behavioral responses consistent with grief when they lose bonded companions, requiring owner awareness and appropriate support during bereavement periods.
Animal grief is a real welfare phenomenon, not anthropomorphic projection. Behavioral and physiological studies document genuine stress responses in animals following the loss of bonded companions. Dogs that lose long-term companions show elevated cortisol, reduced activity, and disrupted sleep patterns. Horses isolated from their herd fellows develop stereotypic behavior and weight loss from reduced feed intake. The duration and severity of grief responses vary by individual and relationship quality. Owners who maintain familiar routines, provide additional social contact, and avoid major environmental changes during the bereavement period support their animal through a genuinely difficult period. Recognizing animal grief as real and responding appropriately is a meaningful welfare intervention available to every pet owner.