A hard keeper or poor doer is a horse or other livestock animal that is naturally prone to be thin, will lose weight quickly, and has difficulty gaining weight.
The Thoroughbred is a breed of horse that is naturally lean and can be difficult to keep in good flesh. This horse is in racing condition and is thin, but not too thin when considering the work that is being asked of it.
The mare in this image is too thin. She has increased nutritional needs because she is nursing a foal. She may be a hard keeper, or she may not be getting enough supplemental feed to support both herself and the foal.
A horse that is elderly and too thin even with adequate forage, such as this horse, may have an underlying dental problem or have trouble digesting a normal diet.
A horse that is not merely a hard keeper, but actually too thin
The Henneke horse body condition scoring system is a numerical scale used to evaluate the amount of fat on a horse's body. It was developed in the early 1980s by Don Henneke at Texas A&M University wi
Hard keeper
…hindquarters, is distinct from that of a starving horse, and a veterinarian can usually provide an expert opinion as to what is normal and what is not. The Henneke horse body condition scoring system is a standardized scoring table produced by Don Henneke, PhD. The Henneke Chart is a scientific method based on both visual appraisal and palpable fat…
Location and order of accumulation of fat deposits in a horse: This horse is moderately overweight, but without significant fat deposits, score 6.