Last updated: September 14, 2026
Every horse owner eventually ends up staring at a feed room shelf, unsure whether they’re overfeeding, underfeeding, or just guessing. I’ve run feed programs for Thoroughbreds in full race training and for the Quarter Horses and pleasure horses at my home—the underlying biology is the same, but the quantities, timing, and composition aren’t, and most of the feeding mistakes I see come from treating every horse’s bucket the same way.
Horses eat primarily forage — hay and grass — which should make up at least 1.5–2% of their body weight daily on a dry-matter basis. Grain and concentrates may be added for horses in heavy work or with higher energy needs. Fresh water must be available at all times, and water needs rise with heat, work, dry forage, lactation, travel, and illness. What a horse eats changes significantly based on workload, age, body condition, and season.
Below is the practical version of that answer: real daily feeding amounts by workload, hay and grain picks, and when it’s time to bring in a vet or nutritionist. If you want the nutrition science behind these numbers, how a horse’s digestive system works and why nutrient needs shift by life stage is covered separately.
Table of Contents
How a Horse’s Digestive System Shapes What It Eats
Horses are built to eat small amounts of forage through much of the day, not to live on a couple of large meals with long gaps in between. That’s why the practical rules stay simple: make forage the base of the ration, split concentrates into smaller meals when they’re needed, and change feeds gradually. Those habits support steadier digestion and help avoid the feeding-related problems that are easiest to prevent. The full digestive biology behind why that matters is worth a read if you want the deeper why.
Miles’s Take — Why I make sure forage is available before concentrate feeding: I make sure my horses have hay before or with their grain, especially if they’ve been standing without forage for a while. When hay goes in first, the horse has something to chew and digest before the grain hits — saliva production goes up, stomach acid gets buffered, and the grain passes through more slowly. Long stretches with an empty stomach followed by a big starch meal is a combination that’s been linked to gastric discomfort, particularly in hard-working horses — recognizing and managing early ulcer signs covers that in more depth. It’s a small habit that makes a real difference.
Hay — The Foundation of Every Horse’s Diet
For most horses, hay and pasture provide the bulk of the daily diet. Horses are designed to consume forage throughout the day, while grain and other concentrates are added only when their energy or nutrient needs can’t be met with forage alone.
The right hay depends on the horse standing in front of you. A retired easy keeper, a growing yearling, a senior with poor teeth, and a Thoroughbred in full training may all need a different forage program. Hay type, maturity, cleanliness, pasture access, workload, body condition, and health history all matter more than the name printed on a bale or what another horse in the barn is eating.
From the barn: My Thoroughbreds in training usually get higher-quality, tested Timothy or a grass-alfalfa mix because their workload demands more from the ration. My pleasure horses do well on solid Alicia or Coastal Bermuda because they don’t need the same energy density. The common denominator is still good forage — each horse just needs a type and amount that fit its job and condition.
When a horse has metabolic concerns, recurrent digestive trouble, unexplained weight changes, or a high-performance workload, a forage analysis gives you far more useful information than appearance alone. Choosing hay for your horse and feeding horses hay go deeper on evaluating quality and figuring out how much your horse actually needs.
Grass and Pasture — Benefits and Risks
Fresh pasture can be an excellent feed source for horses, but it still has to be managed like part of the ration. Many easy keepers can gain more weight on good grass than their owners expect, especially when spring growth or a weather change suddenly improves the pasture. What matters isn’t just whether a horse has grass, but how much it’s eating, what the grass is doing, and whether that horse is the kind that can handle it.
There’s no one acreage rule that works everywhere. How much pasture a horse needs depends on forage growth, soil, rainfall, season, stocking density, rotation, and whether you’re supplementing with hay. Watch grass cover, weed pressure, manure buildup, and the horses’ body condition instead of relying on acreage alone.
When Pasture Needs Closer Management
- Rapid spring or post-rain growth: Fast-growing grass can add calories and nonstructural carbohydrates quickly. Watch easy keepers, overweight horses, and horses with insulin dysregulation or a laminitis history especially closely.
- Frost- or drought-stressed grass: Grass changes when it’s stressed by weather. For horses at risk of laminitis, make turnout decisions with your veterinarian or equine nutritionist instead of assuming the pasture is safe because it looks short or dry.
- Overgrazed pasture: Horses may eat closer to the soil, encounter more weeds, and pick up more sand in sandy areas. Rotate pasture when possible and supplement with hay before coverage becomes thin.
- Sparse pasture or dry lots: If grass isn’t supplying enough forage, provide hay. In sandy areas, ask your veterinarian whether a sand-management plan is appropriate for your horses.
- Easy keepers gaining condition: Even a well-managed pasture can provide more calories than some horses need. Use regular body-condition scoring and adjust turnout before a small weight gain becomes a larger problem.
Spring grass and laminitis — when I pay closer attention: Pasture-associated laminitis is a serious concern, particularly for horses that are overweight, insulin dysregulated, or have had laminitis before. Grass sugar levels can shift with weather, plant stress, species, and local growing conditions, so there’s no turnout schedule that’s right for every horse. Work with your veterinarian or an equine nutritionist on a plan for an at-risk horse. Depending on the horse and pasture, that may include gradual turnout, restricted grazing, a properly fitted grazing muzzle, dry-lot time, tested hay, and regular body-condition monitoring.
In south Louisiana, I watch especially closely during fast spring growth and after weather changes that suddenly green things up. That’s when I’ve seen easy keepers pack on condition faster than their owners expected. Preventing laminitis in horses covers prevention and management in full.
Grain and Concentrates — When Horses May Need More Than Forage
Most horses don’t need grain. Forage should remain the foundation of the diet, and many mature horses in light work or at maintenance do well on good hay, pasture when available, clean water, salt, and a ration balanced for their actual needs.
Grain or another concentrated feed can be useful when forage alone cannot meet a horse’s calorie or nutrient needs. In some cases, the right answer is not more grain at all, but a ration balancer, a mineral supplement, a different forage, or a feed chosen to correct a specific gap.
That often includes horses in hard work, growing horses, late-pregnant or lactating mares, and horses that are struggling to hold condition. The right choice depends on the horse, the hay analysis, workload, body condition, pasture access, health history, and the feed’s actual nutrient profile — not simply whether the bucket contains oats, sweet feed, pellets, or another familiar product.
From the barn: My Thoroughbreds in full training need more calories than my pleasure horses, so their feeding program includes concentrates in addition to quality forage. But I don’t feed grain just because a horse is working. I watch condition, energy, manure, appetite, and how the horse is handling its training, then adjust the whole ration instead of adding more feed by habit.
When concentrates are needed, divide them into smaller meals rather than relying on one large feeding, keep forage available as part of the daily routine, and make any feed change gradually. Horses with insulin dysregulation, a laminitis history, recurrent digestive trouble, or unexplained weight changes need an individualized plan from a veterinarian or equine nutritionist.
Does a Horse Need Grain? Oats, Barley, Both, or None? goes deeper on whether your horse needs grain, how oats and barley compare, and how to choose a concentrate without overfeeding it.
How Workload Changes Calorie Needs
Here are three real daily feeding examples at different workload levels — the same horse, three very different jobs:
| Horse Type | Morning | Midday / Turnout | Evening | Daily Total |
|---|---|---|---|---|
| Pleasure horse (light work or pasture rest) | 8–10 lbs grass hay | Pasture access or slow-feed hay net | 8–10 lbs grass hay | 18–20 lbs hay, no grain, free-choice salt, water |
| Moderate work horse (arena, trail 4–5x/week) | 8 lbs hay + 2–3 lbs grain | Hay net or pasture | 8 lbs hay + 2–3 lbs grain | 18 lbs hay + 4–6 lbs grain split into 2 meals, salt, water |
| Racehorse in full training | 6 lbs quality hay + 4–5 lbs performance feed | Slow-feed hay net in stall | 6 lbs hay + 4–5 lbs performance feed | 15–18 lbs high-quality hay + 8–12 lbs performance feed across 2–3 meals, electrolytes in heat |
These are starting points — adjust based on individual body condition score, season, and forage quality. The best feeding program matches the horse actually standing in front of you. A retired gelding, a growing yearling, and a Thoroughbred in full training all have different jobs, and their feed buckets should look different too.
Weigh hay and concentrate instead of counting flakes or filling the same scoop by eye. A flake can vary dramatically in weight between hay types, cuttings, and bale density, so a small hanging scale is one of the simplest tools for getting a ration closer to right.
Water and Salt Are Part of the Daily Ration
Water doesn’t come from the feed room, but it’s every bit as important as hay or grain. Keep clean, fresh water available at all times and make sure each horse has a dependable salt source. Water needs can rise sharply with heat, hard work, dry hay, lactation, travel, fever, or diarrhea, so pay attention to how much each horse is actually drinking — not just whether the trough looks full.
A sudden drop in water intake, reduced manure output, dullness, poor appetite, or signs of discomfort aren’t things to brush off. Recognizing dehydration signs and knowing when to call the vet is worth reading before you need it.
How Feeding Changes by Workload
The single most important variable in what a horse eats is what it does. A horse doing nothing needs far less than a horse in hard training. Getting this wrong in either direction — underfeeding a working horse or overfeeding an idle one — creates problems that show up in performance, soundness, and long-term health.
| Workload Level | Examples | Forage | Grain / Concentrate | Key Consideration |
|---|---|---|---|---|
| Maintenance (no work) | Retired, companion, pasture rest | 1.5–2% body weight | None or ration balancer only | Obesity risk — monitor body condition score closely |
| Light work | Trail riding 1–3x/week, light arena work | 1.5–2% body weight | 0–0.5% body weight | Many horses need no grain at this level with good hay |
| Moderate work | Regular riding, showing, lessons 4–5x/week | 1.5–2% body weight | 0.5–1% body weight | Monitor condition; adjust grain up or down as needed |
| Heavy work | Endurance, advanced dressage, jumping training | 2–2.5% body weight | 1–1.5% body weight | Ulcer risk increases — consider buffering agents; never skip hay first |
| Race training | Thoroughbreds in full track training | 1.5–2% (quality hay) | 1–1.5%+ body weight | Multiple small grain meals; ulcer management critical; electrolytes in heat |
Body condition scoring — assessing a horse’s fat cover on a 1–9 scale — is the most practical tool for knowing whether you’re feeding the right amount. For many mature horses, a score in the 4-6 range is a reasonable maintenance target, but what’s ideal depends on the horse’s type, job, age, and health history — a racing Thoroughbred and a broodmare aren’t aiming for the same number.
Use the score as a trend, not a verdict: if a horse is gradually gaining or losing condition, that’s the signal to review forage, grain, turnout, workload, teeth, and overall health before making a big change. Check body condition every two to four weeks and adjust feed before a problem becomes serious. Seasonal horse feeding strategies covers how feeding changes across the year, and the feeding picture changes again after age 20 — feeding senior horses covers that stage in full.
When to Call Your Vet or a Nutritionist
This guide isn’t a substitute for individual advice. Bring in your veterinarian or an equine nutritionist before making major feed changes if your horse has laminitis, insulin dysregulation, PPID/Cushing’s, recurrent colic, chronic diarrhea, ulcers, unexplained weight loss, poor appetite, kidney or liver disease, or a history of tying up — and for growing horses and pregnant or lactating mares, where getting the ration right matters more than usual. A hay analysis and a body condition score, reviewed with a professional, will get you further than guessing from a feed label or copying another horse’s ration.
FAQs — What Do Horses Eat?
What do horses eat every day?
Horses eat primarily forage—hay, pasture grass, or both. Many mature horses do well on a forage-based diet with water, salt, and whatever balancing support their forage analysis and needs require. Horses in hard work, growth, pregnancy, lactation, or poor condition may also need a concentrate or another carefully selected feed source. The exact amount depends on the horse, forage, workload, body condition, and health history.
Do horses need grain?
No — many horses do not need grain. Pleasure horses, easy keepers, and horses on good pasture can maintain excellent condition on quality forage alone, sometimes with a ration balancer to fill nutritional gaps. Grain is an energy supplement for horses whose caloric needs exceed what forage can provide: hard-working horses, growing horses, mares in late pregnancy or lactation, and horses that struggle to hold weight. Overfeeding grain to horses that do not need it is a common cause of obesity, laminitis, and metabolic problems.
How much hay does a horse eat per day?
A horse should eat 1.5–2% of its body weight in forage daily on a dry-matter basis. For a 1,000-pound horse, that’s roughly 15–20 pounds of hay as fed per day if not on pasture; for a 1,200-pound horse, about 18–24 pounds. Hay moisture and the individual horse can shift that number. Horses in hard work may need up to 2.5% to maintain condition alongside their grain. Feed by weight rather than by the number of flakes — hay density varies significantly between types and cuttings.
How much water does a horse drink per day?
Horses need clean, fresh water available at all times. Water needs change with heat, work, dry forage, pasture intake, lactation, travel, and illness, so there is no single amount that fits every horse. A horse that suddenly drinks less, passes less manure, seems dull, refuses feed, or shows discomfort deserves prompt attention. See the guide to dehydration in horses for signs to watch for and when to call a veterinarian.
How do I transition my horse to a new feed?
Any change to a horse’s diet should happen over at least 7–10 days. Start by replacing approximately 25% of the current feed with the new feed, then increase to 50% at day 3–4, 75% at day 6–7, and 100% by day 10. Abrupt feed changes can upset digestion and raise the risk of colic or other feeding-related problems, so gradual transitions are the safer approach.
About Miles Henry
Racehorse Owner & Author | 30+ Years in Thoroughbred Racing
Miles Henry (legal name: William Bradley) is a professional horseman based in Folsom, Louisiana. He holds Louisiana Racing License #67012 and has spent over three decades managing Thoroughbreds at premier tracks including Fair Grounds, Delta Downs, and Evangeline Downs.
Expertise & Hands-On Experience: Beyond the track, Miles has decades of experience in specialized equine care, covering everything from hoof health and nutrition to training protocols for Quarter Horses, Friesians, and Paints. Every guide on Horse Racing Sense is rooted in this “boots-on-the-ground” perspective.
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