Shaped by sparse country
A Mustang's metabolism is a survival instrument. On the range, these horses traveled long distances daily across country where forage was coarse, scattered, and low in calories, and their bodies learned to extract everything from very little. Brought into domestic life, that efficiency collides with abundance: soft hay, rich pasture, and bucket feeds deliver in a day what range country might offer in a week. The healthy Mustang diet is therefore an act of translation — recreating the nutritional plainness of the range inside a paddock, while still delivering the minerals, protein quality, and steady intake the horse needs. Get that translation right and Mustangs are famously hardy, easy horses to keep.
Grass hay: the domestic stand-in
Plain grass hay is the closest domestic match to range forage and should be the entire forage base for most Mustangs. Coarser, later-cutting hay is often a better fit than soft, leafy, premium hay grown for harder keepers — the Mustang does not need the extra calories and will simply convert them to fat. Rich legume hay has little place in a typical Mustang's routine. Weigh the hay rather than counting flakes, since flake size varies wildly between bales, and split the daily amount across the day instead of offering it in two large piles. Salt and clean water complete the foundation; a horse walking to water in a larger paddock also gets some of the movement his digestion was built around.
Trickle feeding and slow feeders
Range horses eat in small amounts almost continuously, and a Mustang's gut still expects that pattern. Two large meals with empty hours between them invite both digestive discomfort and the anxious, food-obsessed behavior seen in horses whose forage runs out. Slow-feeder nets and hay pillows stretch each portion across hours, which serves the stomach, the mind, and the waistline at once — the same weighed hay simply lasts longer. Spreading hay in several small piles around a paddock encourages walking between bites, another quiet copy of range life. For a horse whose ancestry is measured in miles per day, how the hay is served matters nearly as much as what the hay is.
The lush-pasture problem
Nothing in a Mustang's background prepared him for fertilized, irrigated, improved pasture, and full-time access to it is the most common route to the breed's domestic health problems: obesity first, and laminitis as the standing risk behind it. Sensible Mustang keeping treats grass as a seasoning rather than a staple — limited turnout hours, a grazing muzzle for the determined eater, a dry lot with weighed hay as home base, and particular vigilance in spring when sugar levels in grass run highest. A Mustang who has already shown signs of metabolic trouble should have his grazing plan set with a veterinarian's input. The horse will lobby for more grass. The breed survived by being very good at wanting food; feeding him well means declining the request.
Settling a newly adopted Mustang onto a routine
A Mustang fresh from holding facilities or the range needs transitions handled gently. His gut microbes are tuned to whatever forage he has been eating, so new hay is introduced over a week or two, mixed in increasing proportions, and any later changes follow the same gradual rule. Grain, if it is ever introduced at all, comes last and smallest — many adopted Mustangs also have to learn that food arrives from people, and hand-fed treats in early days should be plain: a piece of carrot or a handful of hay pellets rather than sweetened feeds. Once the routine is set, record it — hay weight, feeder setup, turnout limits — in KinsLe Care Teams, so the plain diet you designed survives every change of feeder intact.