These horses are usually called "easy keepers."
Easy Keeper
A horse that requires little extra dietary maintenance and maintains a healthy weight is called an easy keeper.
Good Doer
an easy keeper
Easy Keeper
a good doer
easy keeper
An easy keeper
An easy Keeper
For Howrse, easy keeper.
An easy keeper.
This horse is refered to as an "easy keeper".
Easy Keeper howrse answer for riding level 3 === ===