Do Horses Grieve When They Lose a Companion?

Many horse people sense it. Now, recent research provides more evidence that yes — when a companion horse dies, many horses exhibit grief-like responses that can last for months.

This study examined behavioural changes in horses following the death of a companion. Of 325 owners who responded to the survey, many reported noticeable changes in their surviving horse’s behaviour after the loss.

What the study found:

• Within the first 24 hours after the death of a companion, most horses showed changes in behaviour: heightened arousal (≈ 89 %), altered interaction with other horses (~78 %), changed behaviour toward humans (~78 %), increased alertness to environmental stimuli (~73 %), and more vocalisation (~69 %).

• Many horses continued to show shifts in behaviour, mood, or social engagement up to six months after the loss.

• The strength of the bond matters: horses in close “affectionate” relationships showed more pronounced changes — especially around feeding, interacting, or being around others.

• Whether a horse could stay near the body of the deceased companion also influenced how certain behaviours (like vocalisation, excitement about feeding, or interaction) evolved over time. Those unable to access or witness what happened showed more persistent distress, especially heightened vigilance and arousal over time.

Grieving the loss of a companion has real welfare implications. Grief isn’t just a nice sentiment or a human emotion we project onto horses — for survivor horses, loss can cause real, lasting effects that has long-term impact. Mood, appetite, energy, social behaviour, and interest in human interactions can all be disrupted.

The way death is handled on a yard makes a difference. Allowing time and presence with the deceased, recognising behaviour changes early, and offering extra care can help reduce the impact:

• Watch for changes in the first 24 hours and beyond: look for changes in feeding, sleeping, social behaviour, mood, vigilance and interaction with people.

• Be aware that healing takes time: six months or more is not uncommon.

• If possible, allow surviving horses to be near the body or to witness (if safe and feasible). This seems to reduce some prolonged stress.

• Give the surviving horses an opportunity to acknowledge the loss: presence near the body, opportunity to witness or experience what happened (safely and appropriately) seems to help.

• Provide extra care, enrichment, predictable routine, and gentle handling — especially for horses with strong bonds.

Remember that grief is individual. Some horses bounce back quickly, others need more time. Both deserve care and compassion.

Study: Ricci-Bonot et al (2025). Grief-like distress responses in horses after the death of a conspecific. Applied Animal Behaviour Science.