Reading a Horse's Resting Heart Rate: A Simple Baseline Worth Keeping
It takes a minute, it needs no equipment, and it turns a vague feeling that something is off into a number you can act on.
Most of what owners know about their horses is qualitative. It seems a bit flat. It is not quite right today. That knowledge is genuinely valuable, and it is also very hard to communicate to a vet over the phone.
A resting heart rate converts some of it into a number, and it costs a minute.
The ranges
For a healthy adult horse at rest, heart rate sits somewhere around 28 to 44 beats per minute. Respiration is roughly 8 to 16 breaths per minute. Temperature is around 37.2 to 38.3 degrees Celsius, which is about 99 to 101.5 Fahrenheit.
Foals and youngstock run higher than adults. Fit horses often sit at the lower end.
These are reference ranges rather than rules, which is precisely why the individual baseline matters more than the textbook figure.
Why your horse's own number beats the range
A horse that normally rests at 32 and is sitting at 44 is inside the published range and has still changed considerably.
Without a baseline you cannot see that. With one, you have noticed something an hour or a day before it becomes obvious, and you can tell your vet that this horse is normally 32 and is currently 44, which is a far more useful sentence than saying it seems a bit off.
The published range tells you about horses. Your own record tells you about your horse.
Taking it
You can feel a pulse under the jaw, where an artery crosses the bone, or just behind the elbow where the heart beats against the chest wall. Behind the elbow is easiest for most people, particularly with a stethoscope, though a hand works with practice.
Count for fifteen seconds and multiply by four, or count a full minute if the rhythm is not obvious.
If you use a stethoscope, note that each beat sounds like two sounds together. That pair is one beat, not two, and counting the sounds rather than the beats is the classic way to get a number twice as alarming as reality.
Getting a number that means something
The horse must genuinely be at rest. Not just walked in, not just fed, not in the middle of something interesting happening in the next field. Excitement, heat, pain and recent exercise all raise the figure, and a reading taken in any of those conditions is not a resting reading.
Take it at roughly the same time of day, in the same circumstances, several times, so you know what the horse's ordinary number actually is. One reading is a data point. Several are a baseline.
Write it down. A note in your phone is enough, and it will be worth considerably more than your memory of it in six months.
What it is not
It is not a diagnosis. An elevated heart rate tells you that something is going on, not what. Pain, fever, dehydration, excitement and hard work all raise it, and telling them apart is a veterinary job.
What it does is move you from a feeling to an observation. That is a smaller claim than it sounds, and considerably more useful.