The Home Vital Sign Almost Nobody Measures: Resting Breathing Rate

This is the most useful thing you can learn to measure at home, and almost nobody does it.

Resting respiratory rate — the number of breaths per minute while your pet is asleep or fully relaxed — is a genuinely powerful early warning sign, particularly for heart disease. Veterinary cardiologists routinely ask owners to track it, because a rising rate can indicate fluid accumulating in the lungs days before an animal shows any obvious sign of distress.

It costs nothing, takes thirty seconds, and needs no equipment beyond a phone timer.

How to measure it

1. Wait until they're asleep or completely relaxed. Not panting, not just back from a walk, not in a hot room. Asleep is best — it's called *sleeping respiratory rate* for a reason.

2. Watch the chest. One breath = one rise and one fall together. Counting each movement separately is the most common mistake and doubles the number.

3. Count for 30 seconds and multiply by two. Or count a full minute if you want to be precise.

4. Write it down, with the date.

Do it a few times over a week or two while they're well. That gives you their personal baseline — which matters far more than any textbook figure.

What's normal

For a healthy dog or cat at rest:

Under 30 breaths per minute is the general rule
Most healthy animals sit around 15–25 while asleep
Anything consistently over 30 at rest warrants a vet call
Over 40 at rest warrants a same-day call
Over 60, or laboured breathing, is an emergency

Note that this is *resting* rate. A panting dog on a hot day is not a valid measurement, and dogs pant for all sorts of normal reasons.

Cats are different: a cat should not pant. A panting cat, or a cat breathing with an open mouth, is a red flag at almost any time and warrants urgent attention.

Why it matters so much

Heart disease. This is the main use. In dogs with mitral valve disease, and cats with cardiomyopathy, the failure point is fluid backing up into the lungs — congestive heart failure. Resting respiratory rate rises as that fluid accumulates, and it rises before the coughing, the exercise intolerance and the visible distress.

Cardiologists ask owners to track it daily in diagnosed patients precisely because a sustained rise gives a window to adjust medication before a crisis.

If your dog has a heart murmur, or your cat has been diagnosed with heart disease, ask your vet whether you should be tracking this. Many will say yes and be delighted you asked.

Respiratory disease. Pneumonia, asthma, lung tumours, pleural effusion.

Pain. An animal in pain often breathes faster at rest.

Fever, anaemia, shock, heatstroke — all raise it.

What to look for beyond the number

Effort matters as much as rate. Watch for:

Abdominal effort — the belly visibly heaving with each breath, rather than smooth chest movement. This means they're working hard.
Extended neck and head held low and forward — an animal trying to straighten the airway
Elbows held away from the body
Flared nostrils
Open-mouth breathing in a cat — always significant
Noise — wheezing, rasping, gurgling, or a snoring sound when awake
Blue, grey or very pale gums — an immediate emergency
Reluctance to lie down, or only being able to sleep sitting up or propped on the chest

An animal breathing hard who cannot settle, or who is standing with their neck extended and elbows out, needs a vet now, regardless of the number.

Common mistakes

Counting rise and fall separately. One full cycle is one breath.
Measuring after exercise or in the heat.
Measuring a stressed animal. Fear raises the rate.
Only measuring once. A single number tells you nothing. The value is in the trend against their own baseline.
Confusing panting with a raised respiratory rate in dogs. Panting is a cooling mechanism and is normal in context.

Building the baseline habit

The reason to do this while your pet is healthy is straightforward: you cannot recognise abnormal without knowing normal.

An owner who says "his resting rate is 42 and it's normally 20" gives a vet an enormously more actionable piece of information than one who says "he seems to be breathing a bit fast."

Suggested routine:

Healthy adult pet: measure it a handful of times to establish the baseline, then check monthly.
Senior pet, or one with a heart murmur: weekly.
Diagnosed heart disease: daily, as your cardiologist advises. A sustained rise of 20% over baseline across several days is usually the trigger to call.

Other home vitals worth knowing

While you're at it, learn these:

Gum colour. Lift the lip. Healthy is bubblegum pink. Pale or white suggests blood loss, shock or anaemia. Blue or grey means insufficient oxygen — emergency. Brick red can indicate sepsis or heatstroke. Yellow suggests liver disease. Some dogs have naturally pigmented gums; use the inside of the lower eyelid instead.

Capillary refill time. Press a finger on the gum until it blanches white, release, and count how long the pink takes to return. Under two seconds is normal. Longer than that suggests poor circulation.

Heart rate. Feel the pulse on the inner thigh, or place a hand on the chest behind the left elbow. Dogs: roughly 60–140 depending on size (small dogs faster). Cats: roughly 140–220.

Temperature. Normal is roughly 38–39.2°C for both dogs and cats. Requires a rectal thermometer and lubricant. Over 39.5°C is a fever; over 41°C is an emergency. Under 37.5°C is also serious.

Do it tonight

Next time your dog or cat is asleep on the sofa, watch the chest for thirty seconds and write down the number.

That single number, recorded while they're well, may one day be the most useful piece of information you have.

Our community tracker logs resting respiratory rate alongside weight, appetite and water intake, plots the trend, and prompts you when it climbs — which for a pet with heart disease is precisely the warning that buys you the days that matter.