A scale is rarely standing in the stable, so most owners judge their horse's weight by eye. That often goes wrong: a horse you look at every day changes gradually, and your eye adjusts to a few extra or fewer kilos. This overview shows how to assess condition systematically and adjust weight gradually.
Why Judging by Eye Is Unreliable
Horses in the Netherlands are more often too fat than too thin. Good pasture, plenty of hay, and little heavy work make being overweight a common problem, while it happens slowly and therefore stays unnoticed for a long time. Too much weight strains tendons and joints and raises the risk of metabolic problems and laminitis; too little weight often points to too little feed, a dental problem, worms, or an underlying condition.
The problem with estimating by eye is that a winter coat, a round grass belly, or a muscled neck can all distort the picture. That's why vets and nutrition advisors work with two tools that do give something solid to go on: the body condition score and a weigh tape.
The Body Condition Score
The body condition score (BCS) assesses how much fat a horse carries at fixed points on its body. The best-known scale runs from 1 (severely emaciated) to 9 (extremely obese); some vets use a scale from 0 to 5. The principle is the same: you look at and feel a number of points and give each one a score.
You mainly assess these zones:
- Ribs — at a healthy weight you don't clearly see the ribs, but you can easily feel them under a thin layer of fat.
- Neck and withers — a cresty neck (a hard, thick top edge along the neck) points to being overweight; a sharply protruding withers to being underweight.
- Back and loins — a back with a fat groove down the middle is too heavy; a back where the vertebrae stick out is too thin.
- Shoulder and tailhead — fat deposits behind the shoulder and around the tailhead go with too high a score.
| BCS (1–9) | Condition | What You Feel |
|---|---|---|
| 1–3 | Too thin | Ribs, vertebrae, and hips clearly visible |
| 4–6 | Healthy | Ribs not visible but easily felt; smooth outline |
| 7–9 | Too heavy | Cresty neck, fat groove in the back, ribs hard to feel |
For most sport and leisure horses, a healthy score sits around the middle of the scale (roughly 5 out of 9). What's ideal differs by horse, breed, and use: a broodmare, a hard-working competition horse, and an older pony don't share the same target score. Feel free to do the first assessment together with your vet or a nutrition advisor, so you learn what you're feeling for.
Measuring with a Weigh Tape and Weight Formula
A weigh tape gives an estimate of body weight based on girth circumference. You wrap the tape around the chest, just behind the withers and front legs, and read off the estimated weight. It's an estimate, not an exact measurement, but that's enough for tracking a trend.
A more accurate approach is a formula that combines girth with body length (from the point of the shoulder to the point of the buttock). Such formulas and calculators appear on feed suppliers' websites and in vets' educational materials. The absolute number of kilos matters less than the direction: measure the same way every two to four weeks and write it down. A falling or rising trend line tells you more than any single measurement.
Combine both methods: the weigh tape gives you a number to track, the body condition score tells you where the fat sits. A muscular horse can be heavy without being fat, and you only see that from the BCS.
Helping an Overweight Horse Lose Weight
Weight loss in a horse, like weight gain, happens slowly. Don't aim for a quick result, since too strict an approach carries its own risks (such as hyperlipemia, especially in ponies and donkeys). Always draw up a weight-loss plan for these animals together with your vet. Work in small steps and keep tracking the weight.
What generally helps:
- Less or no concentrate feed. Many overweight horses get concentrate feed they don't need given their light workload. Often forage alone, with a vitamin and mineral supplement, is enough.
- Weigh forage, don't feed it freely. A commonly used guideline is roughly 1.5 to 2% of body weight in forage per day; for weight loss, people often calculate with the lower end of that range. Spread it across the day and don't let the stomach sit empty for long.
- Manage grass intake. Spring grass is rich in sugars. A grazing muzzle, a smaller paddock, or limited turnout time helps without the horse standing still all day.
- More exercise. Walking work, lunging (moving the horse in circles on a line), or extra rides burn energy and help maintain condition. Build up the workload gradually in a horse that's significantly overweight, to protect tendons and joints.
Always change feed gradually over a week or more, so the digestive system can adjust.
Helping an Underweight Horse Gain Weight
With an underweight horse, the first question isn't "how do I feed more," but "why is it too thin." Feeding more without knowing the cause rarely solves anything.
Common causes to rule out:
- Teeth — sharp hooks or dental problems make chewing painful; a horse then leaves feed or drops it out of its mouth. An annual dental check is part of basic care.
- Worms — too high a worm burden draws off nutrients. Discuss fecal egg counts and targeted deworming with your vet.
- Too little or too poor feed — sometimes the ration is simply too small for the work the horse does, or the hay is low quality.
- An underlying condition — gastric ulcers, an infection, pain, or a chronic illness can cause weight loss.
Only once those causes are identified do you adjust the ration: more and better forage as the basis, possibly supplemented with concentrate feed or fat-rich products on the advice of the vet or a nutrition advisor. Here too: build up gradually and keep tracking the weight.
When to Involve the Vet
Adjusting a few kilos with feed and exercise you can do yourself, but some signs belong with the vet. Call or consult if you see:
- weight loss that continues despite more and better feed;
- rapid or significant weight loss, or a horse that suddenly eats poorly;
- a cresty neck or overweight combined with complaints that could point to laminitis (sensitive hooves, short strides, heat in the hoof);
- doubt about an underlying cause, or a horse that isn't responding to your adjustments.
When in doubt, always work out a diagnosis and a feeding plan together with a professional. For acute complaints such as suddenly not eating, lameness, or signs of colic (abdominal pain in the horse — always call the vet), the vet is the first point of contact, not an adjustment to the ration.
In Short
Don't assess condition by eye alone. Run through the body condition score monthly — feel the ribs, neck, back, and tailhead — and track the trend with a weigh tape. Adjust weight in small steps: for overweight, mainly through less concentrate feed, managed grass intake, and more exercise; for underweight, first rule out the cause (teeth, worms, illness) before feeding more. Change feed gradually, and bring in the vet as soon as the weight won't respond to adjustment or complaints appear.
See also: Daily Horse Care: The Basic Routine · Recognizing Horse Emergencies and Colic · Jargon: concentrate feed · Level: Considering Your Own Horse