Why Is My Dog Panting Excessively? Common Causes and What to Do
Panting is a normal behaviour for dogs, but when it seems excessive or happens at unusual times, it is natural to wonder whether something more is going on.
Published: 2026-07-29 | Updated: 2026-07-29 | Reading time: 7 min
Quick Answer
Excessive panting can result from benign causes such as heat, exercise, or excitement, but it may also indicate pain, stress, respiratory disease, heart conditions, or metabolic disorders like Cushing's disease. If your dog is panting heavily at rest, at night, or without an obvious trigger, a veterinary evaluation is recommended to rule out an underlying medical issue.
SYMPTOM TRIAGE
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Normal Panting vs Excessive Panting
Dogs pant as their primary method of cooling down. Because they have fewer sweat glands than humans, evaporating moisture from the tongue, mouth, and upper respiratory tract is their most efficient way of regulating body temperature.
Normal panting is typically triggered by identifiable factors.
- Warm weather or high humidity
- Physical activity or vigorous play
- Excitement or anticipation, such as before a walk
- A brief, mild stressor such as a car ride or a visit to the vet
In these situations, the panting is open-mouthed, relatively even, and settles once the dog rests or cools down.
Excessive panting, on the other hand, may appear when there is no clear reason for it. The breathing may be heavier, faster, or more laboured than usual, and it may continue even when the dog is resting in a cool environment. This is the pattern that warrants closer attention.
Common Causes of Excessive Panting
When panting does not match an obvious trigger, several possible explanations should be considered.
Heat and Humidity
Even when the ambient temperature does not feel extreme to you, high humidity can make it difficult for a dog to cool down effectively. Brachycephalic breeds such as Bulldogs, Pugs, and Boxers are especially vulnerable to overheating. Panting that does not resolve after moving to a cooler, shaded area may signal early heat exhaustion.
Pain or Discomfort
Dogs are often stoic about pain, and panting is one of the few visible signs they may show. Abdominal pain, joint discomfort, dental problems, and post-surgical pain can all cause a dog to pant more than usual. If the panting is accompanied by restlessness, reluctance to move, or a change in posture, pain is a strong possibility.
Stress and Anxiety
Situational anxiety, such as separation anxiety, noise phobia from thunderstorms or fireworks, or a change in routine, can cause prolonged panting. The panting may be accompanied by pacing, trembling, drooling, or hiding. In these cases, the panting tends to occur in specific contexts and subsides when the stressor is removed.
Respiratory Conditions
Disorders of the upper or lower respiratory tract can make breathing less efficient, causing a dog to pant more in an effort to compensate. Possible respiratory causes include.
- Laryngeal paralysis
- Collapsing trachea
- Pneumonia or bronchitis
- Asthma-like conditions
These conditions may also produce coughing, wheezing, or exercise intolerance alongside the panting.
Heart Disease
Cardiovascular conditions can reduce the heart's ability to circulate oxygen efficiently, leading to increased respiratory effort. Heart disease may cause panting that worsens at night or after minimal exertion. Older dogs and certain predisposed breeds are at higher risk. Additional signs can include a persistent cough, fatigue, and a swollen abdomen.
Cushing's Disease
Hyperadrenocorticism, commonly known as Cushing's disease, results from prolonged overproduction of cortisol. This hormonal imbalance can cause a range of signs, including excessive panting, increased thirst and urination, a pot-bellied appearance, and thinning of the skin. The panting associated with Cushing's disease tends to be persistent and occurs even at rest.
Other Possible Causes
- Fever. An elevated body temperature from infection or inflammation can cause panting as the dog attempts to cool down.
- Medication side effects. Corticosteroids such as prednisone are known to cause increased panting in some dogs.
- Obesity. Excess body weight places additional demand on the respiratory and cardiovascular systems, which may result in heavier panting.
- Anaemia. A reduced red blood cell count lowers oxygen-carrying capacity, which can lead to increased respiratory effort.
What to Monitor
If your dog is panting excessively, keeping a simple record can help your veterinarian identify the cause.
- When the panting occurs, including time of day and context
- How long each bout lasts
- Whether the panting settles with rest or cooling measures
- Any additional signs such as coughing, lethargy, vomiting, or changes in appetite
- Recent changes in medication, diet, or environment
Share this information with your veterinarian during the appointment.
When to Contact a Veterinarian
A veterinary visit is recommended if any of the following apply.
- Panting occurs at rest in a cool environment
- Panting persists for more than a short period after exercise or heat exposure has ended
- The panting is unusually heavy, sounds laboured, or the dog struggles to catch their breath
- Additional signs are present, such as coughing, lethargy, pale or blue-tinged gums, vomiting, or collapse
- The onset is sudden and severe
Signs such as pale or blue gums, collapse, or severe difficulty breathing indicate an emergency and require immediate veterinary attention.
Frequently Asked Questions
Why is my dog panting at night when it is cool?
Night-time panting in a cool environment can be associated with heart disease, pain, Cushing's disease, or anxiety. If this is a new or worsening pattern, a veterinary examination is recommended to identify the underlying cause.
Can stress cause a dog to pant for hours?
Yes. Dogs experiencing anxiety from separation, noise, or environmental changes may pant for extended periods. If the panting stops when the stressor is removed and no other signs are present, stress is a likely explanation. However, chronic anxiety may benefit from behavioural or veterinary support.
How can I tell if my dog's panting is from heat or illness?
Heat-related panting usually follows exposure to warmth, exercise, or high humidity and improves with cooling and rest. Panting from illness often occurs without these triggers, may happen at rest, and does not improve with cooling measures. If you are unsure, a veterinary check is the safest option.
Is excessive panting a sign of heart disease in dogs?
It can be. Heart disease reduces the heart's efficiency, which may cause a dog to pant more as the body compensates for reduced oxygen delivery. If excessive panting is accompanied by a cough, fatigue, or difficulty breathing, heart disease is a possibility that should be evaluated by a veterinarian.
SYMPTOM TRIAGE
If your dog is panting more than usual and you are not sure whether the cause is something harmless or something that needs veterinary attention, the symptom triage tool can help you assess the situation.
Sources
- Merck Veterinary Manual: "Panting in Dogs" and "Hyperadrenocorticism (Cushing's Disease)"
- American Kennel Club (AKC): "Why Do Dogs Pant?" and "Signs of Heart Disease in Dogs"
- VCA Animal Hospitals: "Panting in Dogs" and "Cushing's Syndrome in Dogs"
- ASPCA: "Heatstroke in Dogs"
- Cornell University College of Veterinary Medicine: "Heart Disease in Dogs"
Disclaimer: This article and the PawAI Symptom Triage tool provide general educational information only. They cannot examine your pet, make a diagnosis, or replace advice from a licensed veterinarian. Contact a veterinarian promptly if symptoms are severe, worsening, persistent, or accompanied by emergency warning signs.