Donkeys (Equus africanus asinus) are among the world's most important working animals, with approximately 40-50 million individuals globally, predominantly in Africa, Asia, and Latin America. Despite their economic and social importance to hundreds of millions of people, donkeys have historically been poorly understood and underserved by veterinary science and welfare research. The past decade has seen significant growth in donkey-specific welfare science.
Donkeys evolved in semi-arid African environments and have behavioral and physiological characteristics distinct from horses that have important welfare implications. Donkeys are highly adapted to sparse, dry environments, requiring less water and surviving on lower-quality roughage than horses. They are stoic to the point of concealing signs of pain and illness effectively — a prey animal adaptation that makes welfare assessment challenging.
Social behavior in donkeys involves strong pair bonding with preferred companions. Separating bonded donkeys causes visible distress. While donkeys can form functional working relationships with horses and mules, same-species social contact is preferred. Isolation causes chronic stress. In working animal populations where donkeys are often kept individually, social needs are frequently unmet.
Donkeys communicate differently from horses: their famous bray is a social vocalization, and subtle behavioral cues including ear position, eye appearance, and body posture convey emotional state. Research by Leanne Proops, Natalie Waran, and colleagues at the Donkey Sanctuary has advanced understanding of donkey cognition and emotional expression, showing donkeys are capable learners, can recognize familiar humans by voice and face, and show measurable emotional responses to positive and negative experiences.
The stoicism of donkeys presents a significant welfare challenge: handlers and even veterinarians may fail to recognize pain in donkeys because outward behavioral signs are subtle. The Donkey Pain Face (DPF) scale, developed by researchers at The Donkey Sanctuary and validated in experimental studies, provides a systematic approach to assessing facial indicators of pain: orbital tightening, ear position changes, muzzle tension changes, and altered facial muscle tone. Routine use of such scales in clinical and field settings improves pain recognition.
Common painful conditions in donkeys include laminitis (often underdiagnosed due to stoicism), dental disease (very common and significantly welfare-limiting), arthritis, gut pain, and wound infections. Dental care is critical: donkeys develop dental problems including sharp enamel points, hooks, and ramps that cause oral pain and affect nutrition. Regular dental examination and rasping by trained personnel are essential welfare practices.
Laminitis in donkeys differs from horses in presentation. Donkeys often show less obvious lameness with laminitis, and classic "sawhorse stance" positioning may be absent. Radiography is often necessary for diagnosis. Hyperlipaemia — a serious metabolic condition unique to donkeys and mules — occurs when energy demands exceed intake, particularly during illness, pain, stress, or transport. Recognizing and treating hyperlipaemia promptly is a critical welfare competency for those working with donkeys.
The welfare of working donkeys in developing countries is the focus of major international programs by The Donkey Sanctuary, Brooke, SPANA (Society for the Protection of Animals Abroad), and local organizations. Common welfare problems include: harness wounds from ill-fitting or abrasive harnesses; overloading beyond carrying capacity; inadequate access to water (donkeys need water multiple times daily during work); insufficient rest; and lack of veterinary care for injuries, disease, and dental problems.
Community-based welfare improvement programs have demonstrated that simple, low-cost interventions can substantially improve working donkey welfare and working capacity. Key interventions include: harness fitting improvements (padded collars, correct fit) that prevent wounds; owner education on load limits, rest requirements, and water access; basic first aid training for common wounds; and mobile veterinary services for treatment and vaccination.
Economic incentives for improved welfare are significant: a healthy, well-maintained donkey works more efficiently, lives longer, and requires fewer emergency veterinary treatments. Demonstrating this productive value to working animal owners is often more effective in motivating welfare improvements than welfare arguments alone.
Donkeys are bred for different purposes: work capacity, pack load, meat production (significant in China and parts of Africa), and increasingly for donkey milk production (used for infant formula for allergic children in some markets). The massive Chinese ejiao industry — producing gelatine from donkey hides for traditional medicine — has driven a global donkey skin trade that creates significant welfare concerns. Donkeys are being traded across borders and slaughtered for skins, with welfare problems throughout the supply chain. Animal welfare organizations have campaigned against the trade.
Breeding management, including pregnancy complications and foaling problems, requires welfare attention. Dystocia in donkeys can be severe, and access to veterinary assistance for difficult births is often limited in working animal communities. Mare and foal welfare during and after birth is an important component of breeding population management.
The Donkey Sanctuary (UK) operates one of the world's largest animal welfare operations, providing sanctuary to thousands of donkeys and mules while simultaneously conducting research, training veterinarians, and supporting field programs. Other sanctuaries operate in the USA (Peaceful Valley Donkey Rescue), Mexico, and elsewhere. Rehabilitation of neglected, injured, and traumatized donkeys requires understanding of their behavioral and physiological needs, including the critical importance of social companionship in recovery.
Current research priorities in donkey welfare science include: standardization of welfare assessment tools for field use in resource-limited settings; pain recognition validation studies in different contexts; behavioral indicators of positive welfare states; nutrition requirements across different climate and work conditions; and training and behavior modification approaches that support positive human-donkey relationships. The Donkey Sanctuary's research programs and partnerships with universities worldwide are advancing this knowledge base.