Dog Panting a Lot or Breathing Fast: Causes and When It's Urgent

When panting is normal and when it isn't

Panting is how dogs cool off, because they sweat very little. It's normal if:

It's hot or your dog has been exercising.
Your dog is excited or nervous, for example at the vet.
It eases with rest, water and shade.

It isn't normal if:

Your dog pants while still or asleep.
It's louder, faster or more persistent than usual.
It doesn't ease after resting somewhere cool.
It comes with restlessness, coughing, weakness or a change in gum color.

How to count your dog's breaths

Count while your dog is asleep or resting quietly, never after exercise or when excited:

Watch the chest: each rise and fall is one breath.
Count for 30 seconds and double it.
Repeat several times over a while.

Vet sources give slightly different numbers, but a healthy dog breathes roughly 12 to 35 times a minute at rest (many give 15 to 30). If it's consistently above 30, tell your vet as soon as possible. If it's around 40 or more while your dog is still or asleep, that's very concerning: go to the emergency vet.

When to see the vet

Go to the emergency vet right now if your dog:

Has a blue, purple or very dark red tongue or gums. Healthy gums are pale pink.
Is working hard to breathe: the belly moves in an exaggerated way, the mouth is open and the neck stretched out, or you hear wheezing or snorting.
Is weak, can't stand or has collapsed.
Is still breathing very fast after resting somewhere cool. Get to a clinic within half an hour.
May have been hit in the chest, eaten rat poison or another toxin, or have heatstroke.

Make an appointment today or tomorrow if your dog is bright, but:

Pants at rest for no clear reason.
Tires quickly with exercise, or has a cough, especially at rest or while sleeping.
Takes consistently more than 30 breaths a minute at rest.
Drinks, pees and eats more than usual, and has a pot belly.

The most common causes

Only a vet can tell which one it is. These are the usual suspects:

Heat and heatstroke. In very hot or humid weather, panting isn't enough to cool down. Short-snouted dogs need extra caution.
Pain. Arthritis, an injury, or back or belly pain can make a dog pant, sometimes with restlessness.
Heart disease. In heart failure, fluid builds up in the lungs: your dog breathes fast at rest, tires sooner and may cough.
Cushing's disease. Excess cortisol weakens the belly muscles and the diaphragm. Besides panting, you may see more hunger, thirst and peeing, a pot belly and a poor coat. It's usually slow and progressive.
Breathing problems. Asthma, bronchitis, laryngeal paralysis, a collapsed windpipe, tumors or choking.
Stress or anxiety, from loud noises like thunder or fireworks, or from a vet visit.
Poisoning. Rat bait, for example, can cause overheating: tell your vet what your dog may have eaten.
Other causes: anemia (low red blood cells) or nerve and muscle diseases.

What to do on the way to the vet

Go straight to the nearest emergency vet, calmly. If you can, call ahead.
Run the car's air conditioning. Heat increases panting and can make breathing worse.
Speak softly and keep your dog from getting worked up. If your dog is weak or can't stand, lay them on their belly with a pillow under the chin and the neck extended.
Don't give human medications.
If you suspect heatstroke, move your dog to a cool, ventilated spot, wet them with tepid or cool (not cold) water, point a fan at them and offer room-temperature water if they're alert. See a vet even if your dog seems to recover: heatstroke can cause internal damage you can't see.

What the vet will do

They'll examine your dog, listen to the heart and lungs and take chest X-rays. Depending on the case, they may run blood and urine tests, an ECG or an echocardiogram (an ultrasound of the heart). If they suspect Cushing's, they'll run specific hormone tests.

Treatment depends on the cause. For heart problems, there are many medications that can be tailored to each dog, and many dogs live normally for months to years with the right treatment. Cushing's is treated with lifelong medication and regular blood tests. After heatstroke, vets run bloodwork and a urinalysis to check the organs.

In the US, an emergency exam averages about $135, X-rays about $172 and an ultrasound about $483. A hospital stay averages about $1,323 at an emergency clinic (Synchrony/CareCredit 2025-2026 cost study). Costs vary by region and clinic. More in what a vet visit costs.

Frequently asked questions

Why does my dog pant at night?

If your dog pants while asleep or resting, it isn't normal. It could be pain, heart disease or Cushing's. Count the breaths and make an appointment; if it's above 40 a minute or you see blue gums, go to the emergency vet.

Is it normal to pant after a walk?

Yes, if it's hot or your dog has been running, and it should settle within 5 to 10 minutes. If heavy panting continues past that, see a vet.

Do short-nosed dogs pant more?

They're at higher risk of breathing problems (brachycephalic airway syndrome) and heat affects them sooner. They need extra care in hot weather.

Could it be anxiety?

Yes: thunderstorms, fireworks or a vet visit can make a dog pant. But don't assume anxiety if the panting continues once your dog calms down: some medical problems look similar.

How many breaths a minute are normal?

About 12 to 35 at rest, depending on the source; most say 15 to 30. If it's consistently above 30, tell your vet, and if it's around 40, go to the emergency vet.

Sources

This article is for general information and does not replace diagnosis or treatment by a veterinarian. If you are worried about your pet's health, call your vet clinic.