The normal range for an adult horse at rest is a temperature of 99.5 to 101.5 degrees Fahrenheit and a heart rate of 28 to 44 beats per minute, as reported by the American Association of Equine Practitioners, with a respiratory rate commonly given as 8 to 16 breaths per minute. Those are population ranges. They tell you where most healthy horses sit, not where yours sits. A horse whose resting heart rate is normally 32 and is now 42 is still "in range" and has climbed by a third, and that is the number that would tell you something is wrong. This article covers the ranges and how to establish your own horse's baseline.
This is the reference piece. If you need the physical procedure for actually taking a reading, that is how to take a horse's temperature, pulse and respiration. If your problem is that the horse will not stand still long enough to get an honest resting number, that is getting a resting heart rate on a horse who fidgets.
The reference table
| Vital sign | Normal range, adult horse at rest | Source |
|---|---|---|
| Temperature | 99.5 to 101.5 F (37.2 to 38.5 C) | American Association of Equine Practitioners |
| Heart rate | 28 to 44 beats per minute | American Association of Equine Practitioners |
| Respiratory rate | Commonly 8 to 16 breaths per minute; some sources give 8 to 12, others up to 24 | Rutgers NJAES FS1262, UConn Extension, and equine veterinary references |
| Mucous membrane color | Moist, pale pink | Extension and veterinary references |
| Capillary refill time | Under about 2 seconds | Extension and veterinary references |
| Gut sounds | Present in all four quadrants, a mix of gurgles and rumbles | Extension and veterinary references |
| Digital pulse | Present but faint, and difficult to feel in a sound foot | AAEP recommends every owner learn to locate and assess it as part of routine laminitis surveillance |
Two honest notes about that table. First, published respiratory ranges genuinely disagree with each other, which is why this article gives you the spread rather than pretending to a single figure. Second, every one of these numbers shifts with age, sex, weight, fitness, and condition, which is exactly why the population range is the beginning of the answer rather than the end of it.
Foals and ponies are numerically different animals
Applying an adult horse's ranges to a newborn foal will frighten you for no reason. Newborn foal figures cited in veterinary references sit far higher:
| Vital sign | Newborn foal |
|---|---|
| Heart rate | Commonly 80 to 100 beats per minute in the first day, and above 60 as a floor |
| Temperature | Roughly 99 to 102 F, with foals under one month commonly cited at 100.0 to 102.0 F |
| Respiratory rate | Commonly 30 to 40 breaths per minute |
Ponies and small horses tend to run at the higher end of the adult ranges, and fit horses at the lower end. A very fit, mature horse with a resting heart rate under 30 is not sick, and a small pony sitting at the top of the range is not either.
The rest of the baseline
Temperature, pulse, and respiration are the three numbers, but they are not the whole picture, and the observations below are what a veterinarian will ask you for on the phone.
- Mucous membranes. Lift the upper lip and look at the gum. Normal is moist and pale pink. Note what your horse's normal actually looks like, because "pale" means nothing until you have seen his usual.
- Capillary refill time. Press a thumb on the gum until it blanches, release, and count how long the color takes to return. Under about two seconds is normal.
- Gut sounds. A stethoscope, or an ear, against the flank on both sides, high and low. What you want is noise. Silence in a quadrant is a finding worth reporting.
- Digital pulse. Felt at the back of the pastern, over the digital arteries. In a sound foot it is faint and hard to find. A pulse you can feel easily, described as bounding, is a significant finding, and it is one of the reasons the AAEP recommends owners learn to locate it.
- Hydration. The skin pinch on the neck or shoulder, and whether the gums are tacky rather than moist.
- Manure and water intake. Not glamorous and frequently the earliest thing to change.
- Attitude. The thing you know best and record least. Write it down anyway.
How to build your horse's own baseline
This is the part that actually answers the question, and almost nothing published online walks you through it.
What to do. Take a full set of readings on five to seven separate quiet days, and write them down. That is the whole method. The discipline is in the conditions.
The conditions that make a baseline usable:
- Same time of day, every time. Early morning, before feeding and before work, is the easiest to reproduce. Body temperature normally drifts through the day, so a morning reading and an evening reading are not comparable.
- At rest, genuinely. Not after being led in from turnout. Not after the feed cart has gone past. Give the horse several minutes of quiet standing first.
- In the same place. The stall or a familiar corner of the barn, not the wash rack.
- On ordinary days. Not the day the farrier came, not after a trailer ride, not in a heat wave.
- Written down at the time, not remembered. A note in your phone counts.
What to record alongside the numbers: the date, the time, the ambient temperature and weather, whether the horse had worked in the last few hours, what he had eaten and when, and anything unusual about the day. Those notes are what let you interpret a strange reading six months from now.
What you end up with is not a single number, it is a band. Something like: temperature 100.2 to 100.8, heart rate 32 to 36, respiration 10 to 14. Once you have that, an out-of-band reading is information even when it sits inside the published population range. That is the whole point.
When to redo it. After a significant change in fitness, after a long layup, after a move to a new barn, and roughly annually as the horse ages. A baseline taken on a five-year-old in work is not the baseline of the same horse at eighteen and retired.
Take a baseline early. The best window for a new horse is during the first two weeks after he arrives, while you are already watching him closely and before you need the numbers. The same applies to a foal in the weeks before weaning, when calm days are still available.
What moved this reading: context versus change
A reading outside the band is not automatically a problem. The first question is always whether something in the situation moved it. This table separates the two, and it is the piece the standard vital-signs page leaves out.
| Reading | Common context effects, not illness | When it is more likely a real change |
|---|---|---|
| Temperature up | Hot, humid weather; direct sun; recent exercise; a heavy winter coat; a rug left on in mild weather; late pregnancy | Elevated in a cool barn, at rest, in the morning, with no obvious explanation |
| Temperature down | Very cold conditions; a wet, clipped horse; a thermometer inserted into manure rather than against the rectal wall | Genuinely low in a horse who is also dull, shivering, or unwell in himself |
| Heart rate up | Excitement, anticipation of feed, a strange person in the barn, recent movement, heat, transport, pain of any kind | Elevated in a horse standing quietly, and staying up over repeated readings several minutes apart |
| Heart rate down | High fitness; a large, mature, relaxed horse | Very low in a horse who is also dull or weak |
| Respiration up | Heat and humidity; exercise; excitement; a dusty barn; flies | Elevated at rest in a cool barn, especially with visible effort, flared nostrils, or abdominal push |
| Respiration up with no other change | Thermoregulation. Horses lose heat partly by moving air | Accompanied by cough, discharge, or fever |
| Gut sounds reduced | A horse who has just eaten a large meal, or is dozing | Quiet or absent in a quadrant, especially with any sign of discomfort |
| Digital pulse felt easily | Recent hard work on hard ground, in a foot with a known bruise | Bounding, especially in both front feet, or with heat, shifting weight, or a reluctance to turn |
The practical rule that falls out of that table: never make a decision on a single reading. Take it again in ten minutes, in quieter conditions, and see whether it moves.
Triage: call now, call today, write it down
This site is written by a horse owner, not a veterinarian, and nothing below is a treatment instruction. It is a list of what to do with a number, and the only actions available are call and record.
Call your veterinarian now, out of hours if necessary:
- Any fever together with dullness, going off feed, or any sign of pain
- A resting heart rate that stays substantially elevated in a calm, standing horse and will not settle. Veterinarians commonly treat a resting heart rate above 50 beats per minute as a threshold for concern when assessing colic, and a high heart rate is associated with a poorer outcome in colic cases
- Absent gut sounds, or gut sounds together with any colic behavior: pawing, flank watching, rolling, repeated lying down and getting up
- Mucous membranes that are dark red, purple, brick, blue, or very pale, or a capillary refill time noticeably longer than about two seconds
- Bounding digital pulses, particularly in both front feet, or a horse rocking back off his front feet
- Breathing with visible effort at rest, flared nostrils, or an abdominal push on each breath
- A late-term mare showing colic-like behavior, which is genuinely hard to tell from pre-foaling restlessness. Why you often cannot tell them apart explains what that looks like
Call your veterinarian today, during hours:
- A temperature above the normal range in a horse who is otherwise bright and eating
- A mild but repeatable change from the horse's own baseline that you cannot explain by context
- A cough, nasal discharge, or a respiratory rate above the horse's band with no obvious environmental cause
- Reduced water intake or a change in manure that persists for more than a day
Write it down and keep watching:
- A single odd reading that returns to normal on the second check
- A reading explained by heat, exercise, excitement, or transport, which comes down as expected
- Anything you noticed but cannot name yet. That note is often the most valuable line in the record
When you call, give the numbers. "He is a bit off" starts a guessing game. "His resting heart rate is normally 32, it is 48 right now, temperature 102.1, gut sounds quiet on the left, and he has not touched his hay since 6am" starts the actual conversation.
What a baseline cannot do
It cannot diagnose anything. A number tells you that something has changed, not what changed. Interpretation is a veterinary job, and there is no version of this article that turns an owner into a diagnostician.
It also will not catch everything. Plenty of serious problems begin with normal vital signs, and plenty of horses feel unwell before any number moves. If your horse's readings are perfect and your gut says something is wrong, trust the gut and call anyway. The baseline is there to make your observations more specific, not to overrule them.
FAQ
What is a normal temperature for a horse?
The American Association of Equine Practitioners gives 99.5 to 101.5 degrees Fahrenheit (37.2 to 38.5 Celsius) for an adult horse. Foals run higher, commonly cited at 100.0 to 102.0 F under one month of age.
What is a normal heart rate for a horse?
28 to 44 beats per minute at rest for an adult horse, as reported by the AAEP. Fit horses often sit at the lower end. Newborn foals are much higher, commonly 80 to 100 beats per minute in the first day.
What is a normal respiratory rate for a horse?
Commonly given as 8 to 16 breaths per minute at rest, though published ranges vary between sources, with some giving 8 to 12 and others extending to 24. Newborn foals are commonly cited at 30 to 40.
How do I find out what is normal for my own horse?
Take a full set of readings on five to seven separate quiet mornings, at the same time of day, at rest, before feed and work, and write them down along with the weather and what the horse had been doing. The band those readings form is your horse's baseline.
What should I do if a reading is outside the normal range?
Take it again in about ten minutes under quieter conditions, then call your veterinarian with the numbers. Nothing on this page is a treatment. An out-of-range reading is information for your vet, not an instruction for you.
Sources consulted: American Association of Equine Practitioners (temperature and heart rate ranges, digital pulse recommendation); Rutgers NJAES fact sheet FS1262, "Measuring Temperature, Pulse and Respiration (TPR)"; UConn Extension, "Vital Signs: What They Mean and How to Take Them for Your Horse"; Penn State Extension, "How to Take Your Horse's Vital Signs"; extension.org, "Temperature, Pulse and Respiration in a Horse"; Merck Veterinary Manual, colic in horses; The Horse, "Normal Vital Signs and Health Indicators". This site is written by a horse owner, not a veterinarian. Nothing here is a diagnosis, a dose, or a treatment instruction.