# Mustang weight and height: why no number fits, and care for an adopted horse

> Why no source gives a Mustang weight or height, a labelled 1,000 pound example for daily hay, a tape caution, and care notes for horses adopted from the BLM.

Canonical: https://lucernel.com/guides/horse-breeds/mustang
Last updated: 2026-11-05

Mustangs descend from mixed stock, none of the sources opened for this page gives a Mustang height or weight, and a horse adopted from the range needs a plan before it needs a number.

**No source gives a Mustang weight or height, so weigh the horse in front of you.** Oklahoma State University describes the Mustang as a feral horse of mixed ancestry, mostly light horse or warmblood type, with draft-type horses held on separate ranges. The arithmetic here uses 1,000 pounds (454 kg), a round number we chose between University of Minnesota averages of 722 pounds for ponies and 1,133 pounds for stock horses. (Oklahoma State University and University of Minnesota Extension (the weight is our choice))

| Source | Height | Weight |
| --- | --- | --- |
| Oklahoma State University | Not given; mostly light horse or warmblood type | Not given |
| Bureau of Land Management adoption FAQ | Not given | Not given |
| University of Minnesota, 53 adult ponies (comparison) | Average 51 inches | Average 722 lb |
| University of Minnesota, 493 stock-type horses (comparison) | Average 60 inches | Average 1,133 lb |

The Minnesota rows are comparison groups. They are not Mustang measurements.

## A mix of ancestries

Oklahoma State traces the Mustang to Spanish horses that mixed over the centuries with settler stock, French and draft blood and old-style East Friesian coach horses bought for the cavalry. It says most Mustangs are of light horse or warmblood type, that the coat colors cover the full range, and that a few isolated herds such as the Kiger and Cerat strongly show Spanish breeding. With ancestry like that, a horse from one herd can differ a great deal from another, and any single figure would mislead.

## Daily hay for a 1,000 pound Mustang

The arithmetic uses 1,000 pounds as an example only. Replace it with a scale weight or a tape estimate for your own horse.

Merck gives 2 to 2.5% of body weight in dry matter as the usual daily maximum, with at least 1.5 to 2% from forage, and 1.5% for an obese horse. These figures are our arithmetic, counting hay as 90% dry matter.

- 1.5% of body weight: 15 lb (7 kg) of dry matter, about 17 lb (8 kg) of hay
- 2% of body weight: 20 lb (9 kg) of dry matter, about 22 lb (10 kg) of hay
- 2.5% of body weight: 25 lb (11 kg) of dry matter, about 28 lb (13 kg) of hay

## A weight tape example for a Mustang

The horse weight calculator uses the adult equation in the Merck Veterinary Manual: heart girth squared times body length, in inches, divided by 330. With a heart girth of 73 inches and a body length of 62 inches gives 73 x 73 = 5,329, times 62 = 330,398, divided by 330 = about 1,001 lb (454 kg). Those measurements are our illustration, not a real horse.

Merck says weight tapes can be used on ponies and horses but are not suitable for draft horses. Oklahoma State records draft breeding in the Mustang’s history, so treat the estimate for a heavy-boned horse as rough and use a scale when one is available. An ungentled horse should not be measured until it accepts handling.

## The first months after adoption

The Bureau of Land Management says it vaccinates, deworms and freeze-marks every horse offered for adoption, that a veterinarian gives the pre-adoption medical care, and that you receive a record with a negative Coggins test, which shows no equine infectious anemia. Its facility rules ask for at least 400 square feet of corral per animal, and it warns against releasing an ungentled horse into a large open area, where you may not be able to catch it for training or veterinary care. Oklahoma State adds that adopted Mustangs need experienced handlers but usually become as tractable as any farm-raised horse.

## Feeding a range horse

Merck says equine metabolic syndrome is most common in ponies and in Saddlebreds, Tennessee Walking Horses, Paso Finos, Morgans and Mustangs. For an affected horse it advises low sugar hay in a slow feeder, 2% of body weight a day at a score of 5 of 9 and 1.5% when obese, with grazing, grain and treats removed. A horse that arrives lean and starts to gain on hay and pasture is worth a vet visit before the neck turns cresty, and UC Davis warns that laminitis damage cannot be reversed.

## Body condition

Merck advises a score of 4 to 6 on the 9 point Henneke scale. Record the score and a weight on the day the horse comes home, so later changes have a baseline. The University of Minnesota found that 14% of stock horses, ponies and Arabians scored 7 or more.

## Frequently asked questions

### How much does a Mustang weigh?

No source opened for this page gives a Mustang weight. Oklahoma State describes mixed ancestry, mostly light horse or warmblood type, so sizes vary and a scale or a tape is the reliable answer.

### How tall is a Mustang?

No source opened gives a Mustang height. Measure the withers of your own horse and compare it against the type of horse it resembles.

### Can a Mustang carry a 190 pound rider?

The University of Minnesota reports that an average adult light riding horse can comfortably carry about 20% of its ideal bodyweight, rider and tack included. For an assumed 1,000 pounds that is about 200 pounds, so a 190 pound rider with 25 pounds of tack is 15 pounds over. Oklahoma State calls adopted Mustangs usually fine riding animals and exceptional in endurance trials.

### Can I use a weight tape on a Mustang?

Merck says tapes suit ponies and horses but not draft horses, and tend to underestimate. A Mustang with heavy draft breeding is the case to treat with caution.

## Sources (checked 2026-10-02)

- [Oklahoma State University, Breeds of Livestock: Mustang Horses](https://breeds.okstate.edu/horses/mustang-horses)
- [Bureau of Land Management, Wild Horse and Burro Adoption and Sales FAQ](https://www.blm.gov/programs/wild-horse-and-burro/adoption-and-sales/adoption-faq)
- [Merck Veterinary Manual, Equine Metabolic Syndrome](https://www.merckvetmanual.com/metabolic-disorders/equine-metabolic-syndrome/equine-metabolic-syndrome)
- [UC Davis Center for Equine Health, Laminitis (archived copy)](https://web.archive.org/web/2025/https://ceh.vetmed.ucdavis.edu/health-topics/laminitis)
- [University of Minnesota Extension, Guidelines for weight-carrying capacity of horses](https://extension.umn.edu/agriculture/animals-and-livestock/horse/guidelines-for-weight-carrying-capacity-of-horses)
- [University of Minnesota Extension, Estimating actual and ideal bodyweight of adult horses](https://extension.umn.edu/agriculture/animals-and-livestock/horse/estimating-horse-bodyweight)
- [Merck Veterinary Manual, Nutritional Requirements of Horses and Other Equids](https://www.merckvetmanual.com/management-and-nutrition/nutrition-horses/nutritional-requirements-of-horses-and-other-equids)