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An easy keeper, easy doer, or (British English) good doer is a horse that can live on relatively little feed. The opposite of an easy keeper is a hard keeper (poor doer), an animal that is prone to be too thin and has difficulty maintaining adequate weight.
Easy keepers tend to be found most often in breeds originally developed to survive under harsh conditions. Most pony breeds are easy keepers, and smaller, hardy horse breeds such as the Arabian or types such as the mustang have many representatives with this trait. Many draft horse breeds, such as the Percheron, are also easy keepers, as are most mules and donkeys. If overfed with a too rich, modern diet, the easy keeper is prone to obesity and other health problems, including laminitis and metabolic disorders.
Easy keepers may be confused with a mare that is pregnant, but an easy keeper tends to gain weight all over its body, not just in the belly. Easy keepers are not always easy to distinguish from a normal horse that is too fat from simple overfeeding. An easy keeper, though, gains weight more quickly and loses weight more slowly than an ordinary horse, and when fed a standard diet geared toward an average horse, will gain, rather than maintain, weight.
While keeping enough weight on an easy keeper is not problematic, modern animal husbandry practices are often a challenge to such animals, as a modern diet can lead to a number of health problems, including obesity and, in some cases, laminitis. Some easy keepers may be prone to insulin resistance or equine metabolic syndrome (EMS), and possibly are more likely to develop equine Cushing's disease later in life. Easy keepers with a susceptibility to various metabolic problems are also more prone to develop a "cresty" neck, and to not lose weight in that area, even when placed on a diet. Regularly monitoring the horse's body condition score on a regular basis assists in helping the horse maintain proper weight.