A Dog's Resting Heart Rate: Normal Range and Why It Matters
Have you ever watched your dog lie still and worried that its heart seemed to be racing? This article explains what a dog's resting heart rate is, the normal range by body size and why it matters, and how to check it yourself at home — all grounded in veterinary references.
What is a resting heart rate?
A dog's resting heart rate is the number of times the heart beats per minute (bpm) while the dog is calm, at rest, or asleep — without excitement or exercise. According to the MSD Veterinary Manual, when a dog is at rest the sinoatrial node, which sets the heartbeat, fires at roughly 60-120 times per minute (MSD Veterinary Manual). Resting heart rate is reported across a wide range depending on the source; this article uses the roughly 60-120 bpm range supported by the MSD Veterinary Manual.
The key condition is "at rest." Walks, play, heat, pain, and the tension of an unfamiliar environment all push the heart rate up temporarily, so to gauge your dog's normal state it's important to measure when it is fully settled.
Normal range for a dog's resting heart rate
Smaller dogs are faster
Even among dogs, the normal heart rate differs by body size. The MSD Veterinary Manual explains that larger dogs tend to have a slower sinoatrial firing rate and therefore a slower heart rate (MSD Veterinary Manual). The American Red Cross's pet first-aid materials give the following resting heart rates by body size (American Red Cross).
| Body size | Resting heart rate |
|---|---|
| Medium and large dogs (~13 kg+) | about 60-100 bpm |
| Small dogs (under ~13 kg) | about 100-140 bpm |
Puppies also tend to have faster heart rates than adult dogs. So it is natural for a small dog at rest to beat faster than a large one, and a higher number alone does not mean something is wrong.
Why dogs are faster than people
Compared with an adult human, dogs generally have a faster resting heart rate. Smaller bodies have a higher metabolic rate, so the heart has to beat more often — a normal physiological difference.
A healthy dog at rest may also show variation in which the heart speeds up on inhalation and slows on exhalation. This is called respiratory sinus arrhythmia, and it is considered normal in a comfortably resting dog (MSD Veterinary Manual).
Why resting heart rate matters
Because resting heart rate is a "baseline" with the excitement factors removed, it reflects everyday health relatively consistently. Knowing the trend of resting heart rates measured under the same conditions helps you notice changes sooner when something is different from usual.
For example, if your dog is consistently faster or slower than usual even at rest, that is not a diagnosis in itself, but it can be a signal worth looking into. What matters is not a single one-off number, but the direction of change relative to the norm.
How to measure resting heart rate at home
Measuring by hand
When your dog is lying comfortably, you can check as follows.
- Lightly place your index and middle fingers on the femoral artery in the middle of the inner thigh of a hind leg (avoid the thumb, as you may feel your own pulse).
- Or rest your palm on the inner chest behind the left front leg to feel the heartbeat.
- Count the beats for 15 seconds and multiply by 4 to get the beats per minute.
To get close to a true "resting" figure, measure when your dog is well rested — not right after exercise or while excited.
Recording a baseline
Measuring accurately by hand every time is hard, and the value wobbles easily if the dog moves or tenses up. That's why it helps to consistently record the resting heart rate while your dog rests or sleeps, so you know its usual baseline.
cotons ai's sense 1 home uses ballistocardiography (BCG) to measure and record resting heart rate while your dog rests or sleeps. Keeping a daily record as data can help you notice changes from the norm sooner.
When to talk to your vet
In the following cases, it is safer to consult a vet rather than judging on your own.
- The resting heart rate stays faster or slower than usual even without temporary factors such as excitement, exercise, or heat
- The heartbeat repeatedly feels like it skips or pauses irregularly
- Other signs appear alongside it, such as lethargy, coughing, labored breathing, or a change in gum color
Don't diagnose your dog from a single number — have it checked at the animal hospital along with your everyday records.
Frequently asked questions
How many beats per minute is normal for a dog's resting heart rate?
It varies by body size, but the MSD Veterinary Manual uses roughly 60-120 bpm at rest as a reference. By body size, medium and large dogs are slower (about 60-100 bpm) and small dogs faster (about 100-140 bpm) (American Red Cross).
Is it okay that the heart rate slows down during sleep?
A lower heart rate during rest or sleep is normal. The variation in which the rate speeds up on inhalation and slows on exhalation (respiratory sinus arrhythmia) is also considered normal in a comfortably resting dog.
What should I do if the heart rate stays faster than usual?
First check whether there was a temporary factor such as excitement, exercise, or heat. If a fast resting rate persists with no such cause, it's best to consult a vet.
What if home measurements are inaccurate?
Values measured by hand wobble easily with the dog's movement and tension. Measuring several times to compare, or using a tool that automatically records resting heart rate to confirm the baseline, makes changes easier to spot.
Key takeaways
- A dog's resting heart rate is the beats per minute while comfortably at rest; the MSD Veterinary Manual references roughly 60-120 bpm at rest (MSD Veterinary Manual).
- Smaller dogs are faster — about 60-100 bpm for medium and large dogs and about 100-140 bpm for small dogs, with puppies tending to be faster still (American Red Cross).
- Respiratory sinus arrhythmia, where the heart rate changes with breathing, is normal in a resting dog.
- What matters is not a single number but the change relative to the usual baseline; if you suspect a problem, consult a vet.
Closing
Resting heart rate is a basic indicator that reflects your dog's everyday condition. Recording its usual resting heart rate baseline with sense 1 home can help you notice even small changes sooner. That said, no measurement replaces veterinary care, so if you suspect a problem, be sure to consult your vet.
This content is for general informational purposes only and does not replace veterinary care.
Sources / References
- MSD Veterinary Manual (Merck Veterinary Manual), "Introduction to Heart and Blood Vessel Disorders in Dogs" — sinoatrial firing of 60-120 per minute at rest, slower heart rate with larger body size, respiratory sinus arrhythmia. https://www.merckvetmanual.com/dog-owners/heart-and-blood-vessel-disorders-of-dogs/introduction-to-heart-and-blood-vessel-disorders-in-dogs
- MSD Veterinary Manual (Merck Veterinary Manual), "Heart Disease: Conduction Abnormalities in Dogs and Cats" — respiratory sinus arrhythmia is a normal finding in a comfortably resting dog. https://www.merckvetmanual.com/circulatory-system/heart-disease-conduction-abnormalities-in-dogs-and-cats/heart-disease-conduction-abnormalities-in-dogs-and-cats
- American Red Cross, "Normal Temperature, Heart and Breathing Rate for Dogs" (Pet First Aid) — resting heart rate by body size (60-100 bpm for medium and large dogs, 100-140 bpm for small dogs). https://www.redcross.org/take-a-class/resources/learn-pet-first-aid/dog/normal-temperature-heart-breathing-rate