Old Dog Panting at Night: Causes and a Breathing-Rate Check

Why is my old dog panting at night?

Night panting in an older dog usually has a cause worth finding: pain, heart disease, Cushing’s disease, cognitive decline or a room that is too warm.

Dogs pant to cool down, and the Merck Veterinary Manual says the upper airways play a role in temperature regulation for animals that use panting this way. A warm room can cause panting. A dog that is cool, lying down and still panting needs a vet to look for the cause.

This page gives you one measurement you can take at 2 a.m. and a way to sort the likely causes before you call your vet. Panting often comes with other signs, such as drinking more water or night pacing, so note those too.

How do I count my old dog’s sleeping breathing rate?

Count the breaths your dog takes in 60 seconds while it is asleep and resting, and do it on several nights.

Veterinary cardiologists use this number to follow dogs with heart disease. The Merck Veterinary Manual says a vet may ask you to count breaths while your dog is sleeping or resting, so the rate can be tracked to catch early heart failure.

Steps:

1. Wait until your dog is asleep and lying quietly. Do not wake it, and do not count right after a walk, a meal or a noise.
2. Watch the chest or flank. One rise and fall is one breath.
3. Set a timer for 60 seconds and count every breath. A 30-second count doubled works too, but a full minute is steadier.
4. Write down the number, the date and the time.
5. Repeat on several nights. The 2012 study asked owners for 12 to 14 one-minute counts over one week to two months.
6. Average your counts and note the highest one.

Worked example. On night one you count 11 breaths in 30 seconds. That is 11 × 2 = 22 breaths a minute. On night two you count 14 in 30 seconds, which is 28. On night three you count 17 in 30 seconds, which is 34. The average is (22 + 28 + 34) ÷ 3 = 28. The highest is 34. These numbers are made up to show the arithmetic. The average sits near the 30 line and the rate is climbing, so this dog needs a vet visit and the log goes with it.

If your dog will not settle and is panting while awake, you cannot use this count. Panting is faster and open-mouthed, and the studies did not measure it. Note the time and call your vet.

What is a normal sleeping breathing rate for an old dog?

Healthy adult dogs average well under 30 breaths a minute asleep; in one study of 114 dogs the average was 13.

The study, published in Research in Veterinary Science in 2012, had owners count breaths at home. No dog averaged above 23 breaths a minute. Three dogs had a single count above 30. Age, body weight and location did not change the average. The authors concluded that apparently healthy adult dogs generally stay under 30 and rarely exceed it.

The 114 dogs were adults, not a group of dogs over 12, so treat 30 as a benchmark for every adult dog and ask your vet whether your senior needs a lower line.

A 2025 study of 703 healthy dogs wearing a collar sensor found respiratory rate was lower at night than by day. It also found a slight rise in older dogs. The paper does not set a separate sleeping-rate cutoff for senior dogs, so 30 stays your line.

What breathing rate is too high for a sleeping dog?

A sleeping count that stays above 30 breaths a minute on repeated nights is the level at which vets want to hear from you.

The 30 line comes from two studies: 114 apparently healthy adult dogs and 51 dogs with medically controlled heart failure. A 2016 study in The Veterinary Journal had owners count at home in 51 dogs with congestive heart failure that was well controlled on treatment. The median sleeping rate was 20 breaths a minute (range 7 to 39). Eight dogs averaged 25 or more, and one averaged 30 or more. The authors said most stable, treated dogs stay under 30. The same paper reported that the median resting (awake) rate was higher, 24, with seven dogs at 30 or more. This is why the count is taken asleep.

Some healthy dogs have a single count above 30, and one treated dog averaged higher. A high count means it is time for an exam, and the exam finds the cause, whether heart, lung or something else. If your vet gives you a different limit for your dog, use theirs.

What causes an old dog to pant and pace at night?

The five main causes are pain, heart disease, Cushing’s disease, cognitive decline and heat, and the signs below help tell them apart.

Cause	Signs that go with night panting	What a vet checks	Sleeping breath count clue
Pain (often arthritis)	Reluctance to move, irritable when touched, restless at night, trouble finding a position	Joint and spine exam, pain trial	No set pattern
Heart disease or heart failure	Coughing, trouble breathing, tiring on walks, fainting or collapse	Listening to the heart, chest X-rays, heart ultrasound	Rises with developing or uncontrolled failure; dogs with subclinical disease or controlled failure commonly stay under 30
Cushing’s disease	Panting together with increased thirst and urination, hunger, thin skin, hair loss	Blood and urine tests, hormone tests	No set pattern
Cognitive decline	Pacing, vocalizing, sleeping more by day, house-soiling, new anxiety	Exam to rule out pain and organ disease first	No set pattern
Heat or a stuffy room	Panting that eases when the room cools	Nothing, if it settles	Falls once the room is cool

Sources for the table: coughing, difficulty breathing, fainting and the faster-breathing sign come from the Merck Veterinary Manual on heart failure. Pain, cognitive signs and the overlap between them come from a 2026 review of canine cognitive dysfunction. The Cushing’s signs come from the case criteria in a 2026 Frontiers in Veterinary Science paper, which lists excessive panting among them. The last column draws on the breathing studies above.

One cause can hide another. The same review notes that undertreated osteoarthritis pain is a major confounding factor in cognitive decline, and that pain can make cognitive signs worse. A dog can have more than one problem.

Could my old dog’s night panting be dementia?

Cognitive decline can cause night restlessness, and in a 2026 survey of 205 owners, over half of the dogs were most unsettled between 02:00 and 05:00.

The survey covered dogs aged 8 and older. Dogs with more severe cognitive impairment were reported to sleep less at night and more by day, with poorer sleep and more night-time elimination. It was owner-reported, so it shows patterns and not a diagnosis. The screening model showed moderate discrimination between mild and more severe cognitive impairment (AUC 0.69).

The 2026 clinical review says affected dogs often sleep more in the day and have restlessness, pacing or vocalizing at night. It does not list panting as a core sign. If your dog paces and pants, the review’s own advice is to rule out pain and organ disease before settling on dementia.

These signs overlap. A raised sleeping rate calls for an exam of the heart, lungs and the rest of the body, and a dog without pacing or confusion can still have cognitive dysfunction. For what to expect next, see dog dementia signs and how to calm a dog with dementia at night.

What is Cushing’s disease and does it cause panting?

Cushing’s disease is a common hormone disease of adult and aged dogs, and excessive panting is one of the signs vets use to suspect it.

The Merck Veterinary Manual says Cushing’s disease (hyperadrenocorticism) is common in adult and aged dogs, caused by chronic excess of the hormone cortisol, and that a pituitary tumor accounts for 85% to 90% of cases. A 2026 paper in Frontiers in Veterinary Science lists excessive panting among the signs, together with excess thirst and urination, hunger, hair loss and thin skin, plus abnormal hormone test results.

The signs overlap with aging, which is why vets test to confirm it. If your dog drinks and urinates more than before and pants at night, mention both when you call.

When should I call the vet about night panting?

Call now if your dog has trouble breathing, collapses or faints, coughs with breathing trouble, or pants without settling while resting in a cool room.

Call-now list, with what supports each item:

• Visible effort to breathe, or difficulty breathing. Merck lists difficulty breathing as a common sign of left-sided heart failure.
• Fainting or collapse. Merck says many dogs with left-sided heart failure faint or collapse.
• Coughing with the panting. Merck lists coughing as a common sign.
• A sleeping breath count above 30 on repeated counts. This is the level that healthy dogs rarely exceed.
• Panting that does not settle in a cool room. Call your clinic or an emergency vet and describe it.

Book a visit in the next few days if the panting is new but your dog is breathing easily, eating and responding to you, and the sleeping count is under 30. Bring your log of counts, a short phone video of the breathing, and a note of when the panting starts.

For pain signs such as slowness to rise, see what causes an old dog’s back legs to give out and the signs of dog arthritis. More senior dog guides are in the guides section.

What can I do tonight while I wait for the vet?

Count the sleeping breaths, cool the room, let your dog rest somewhere quiet and write down what you see.

• Keep the room comfortable and cool, since panting is how dogs shed heat, and give water within reach.
• Put the bed on a non-slip surface, in case pain or confusion makes getting up hard.
• Count breaths once your dog is asleep, and log the number.
• Film 30 seconds of breathing and any pacing.
• Do not give human pain medicine. Dosing and drug choice are for your vet.

If your dog is awake and panting and none of the call-now signs apply, the next step is the log and an appointment.

Where the numbers come from

The breathing-rate benchmarks come from adult dogs counted by owners at home, and the heart-failure figures come from 51 dogs treated by cardiologists. The 703-dog collar study covered healthy dogs with a median age of 3.8 years, and the sleep survey rests on owner reports. Use your counts to start the conversation with your vet, who can examine your dog.