Donkeys strongly benefit from living with at least one other donkey, and most experts consider a companion essential rather than optional. In the wild, donkeys form flexible social groups that can include stable harems averaging five adults when resources are plentiful. Domestic donkeys take this even further, forming deep, long-lasting preferential bonds that researchers have compared to the pair-bonding seen in primates and some birds. Keeping a donkey alone puts it at risk for behavioral problems, depression, and even a potentially fatal metabolic condition.
Why Donkeys Are Wired for Companionship
Donkeys descended from the African wild ass, a species that adapted to harsh, arid environments by being socially flexible. When food and water were scarce, wild asses could survive with minimal social bonds beyond a mother and her foal. But when conditions improved, they naturally organized into relatively stable groups. Domestic donkeys, living in environments where resources are generally consistent, have taken that social flexibility in the direction of forming extremely strong attachments.
Research on domestic donkeys has documented what scientists call “pair-bonds,” defined as reciprocal preferences between two specific individuals. These aren’t casual associations. Donkeys in bonded pairs seek each other out across different situations, whether resting, grazing, or moving through a field. One study noted that donkeys maintained small numbers of strong “friendships” that were long-lasting, though the way those friendships expressed themselves could shift depending on context. This level of social complexity means a donkey doesn’t just tolerate a companion. It actively invests in that relationship.
What Happens to a Lonely Donkey
A donkey kept alone will typically show clear signs of distress. Common behaviors include pacing, excessive braying, chewing on fences, and refusing to eat. Over time, if the isolation continues, these stress behaviors can give way to something more concerning: depression. Depressed donkeys become lethargic, lose interest in their surroundings, and stop responding to things they’d normally enjoy, like having their ears rubbed or their withers scratched.
This shutdown can become severe. Veterinarians working with chronically stressed donkeys have described animals that show no reaction at all to pleasurable touch, a state comparable to learned helplessness. One veterinarian recounted approaching a thin, injured donkey and scratching areas that normally produce a visible pleasure response (drooping head, relaxed lower lip, closing eyes) and getting absolutely nothing. The donkey appeared “totally shut down.” Researchers have mapped these behavioral profiles against clinical criteria for major depression and complex post-traumatic stress, finding significant overlap, including signs of emotional numbing, hypervigilance, and anhedonia (the inability to feel pleasure).
The Physical Health Risk: Hyperlipemia
Isolation stress in donkeys isn’t just a behavioral concern. It can trigger a dangerous metabolic condition called hyperlipemia, in which the body floods the bloodstream with fat in response to negative energy balance. Donkeys are uniquely susceptible to this. Stressful situations like transport, changes in housing, or the loss of a bonded companion can set it off, and mortality rates run between 40% and 80% if it isn’t caught and treated quickly.
This is why veterinary guidelines specifically recommend that if a donkey needs to be hospitalized, it should be housed with a companion. The recommendation isn’t just about comfort. It’s about reducing the risk of a secondary condition that could kill the animal. Triglyceride levels should be monitored in any donkey showing dullness, behavioral changes, reluctance to move, or loss of appetite, all of which can result from social stress.
When a Bonded Companion Dies
Losing a companion is one of the most dangerous periods for a surviving donkey. The grief response can be intense: the remaining donkey may stop eating, become withdrawn or unusually reactive, and break from its normal daily routine. Because donkeys are prone to hyperlipemia under exactly these conditions, a grieving donkey needs close monitoring. Any persistent change in behavior or appetite warrants veterinary attention, and finding a new companion sooner rather than later can help prevent a downward spiral.
Can Other Animals Fill the Role?
Donkeys can share pasture with horses, goats, sheep, and other animals, and some of these arrangements work well. Donkeys and horses in particular sometimes develop close relationships. But whether another species truly satisfies a donkey’s social needs depends heavily on the individual animal.
There are practical complications to mixed-species housing. Mineral supplements formulated for cattle can be toxic to donkeys, and sheep can develop copper toxicity from equine supplements, so shared feeding areas require careful management. Donkeys rescued from abusive or neglectful backgrounds may react aggressively to unfamiliar animals in their space, sometimes with fatal consequences for smaller species like goats or poultry. Introductions should always be gradual and supervised.
Even when a donkey gets along with another species, the relationship may not provide the same depth of social engagement as another donkey. Mutual grooming, a behavior central to donkey social life (and scientifically shown in equines to lower heart rate), is most naturally expressed between donkeys. A horse can be a good companion, but the ideal partner for a donkey is another donkey.
Space and Practical Needs for Two Donkeys
Keeping a pair doesn’t require vast acreage. The Donkey Sanctuary recommends a minimum of half an acre per donkey, so two donkeys need at least one acre of pasture. You don’t need to graze the whole area at once; rotating access helps maintain pasture quality. Beyond space, the key requirements are separate access to food and water if you’re also housing other species, adequate shelter, and regular hoof and dental care.
Two donkeys kept together on appropriate pasture with basic needs met will typically be calmer, healthier, and easier to manage than a single donkey. They regulate each other’s stress through proximity, mutual grooming, and the simple reassurance of a familiar companion nearby. For most owners, keeping a pair isn’t twice the work. It’s often less, because you’re not dealing with the behavioral fallout of a lonely, anxious animal.