This is a perfect description of an 'easy keeper'.
This type of horse is refered to as an "easy keeper".
A "hard keeper" is a horse that requires more feed to maintain health and body condition than the average horse under the same circumstances.
A horse that requires little extra dietary maintenance and maintains a healthy weight is called an easy keeper.
An easy keeper
Easy keeper
easy keeper
Easy Keeper
a good doer
easy keeper
For Howrse, easy keeper.
An easy keeper.
This horse is refered to as an "easy keeper".