Why dogs pant
Panting is a dog's main cooling mechanism — evaporative cooling from the tongue, mouth, and airways, since sweat glands sit only in the paw pads. Normal triggers are heat, exercise, and excitement. Problem triggers include stress or anxiety, pain, steroids, heatstroke, and disease — heart or lung disease, Cushing's, and fever. The AKC adds that heavy panting with coughing can signal lung or airway disease.
Normal vs abnormal
Normal panting eases within 10–30 minutes of rest and cooling. Abnormal panting occurs at rest, in a cool room, or starts suddenly with no heat or exercise. Red flags per PDSA and the AKC: labored or frantic panting, gum color change (blue, pale, or bright red), collapse, lethargy, drooling, vomiting, or nighttime panting with no heat. A resting respiratory rate persistently above about 30 breaths/min is worth tracking.
What to do
Ask what the dog was doing — hot day, exercise, excitement? Then cool, calm, and give water. For overheating: wet with cool (not ice-cold) water, move to shade or AC, offer water, and call the vet; never leave a dog in a hot car. For stress panting: remove the trigger and create a calm space. If panting is new, at rest, or with other symptoms, book a vet exam. If a new medication preceded it, tell the vet.
Breed note
Brachycephalic breeds — Pugs, Bulldogs, French Bulldogs, Boston Terriers — and overweight dogs overheat faster and are more prone to airway obstruction, so their panting needs closer monitoring. Senior and middle-aged dogs: resting panting is a classic early sign of Cushing's and of heart or lung decline. Humidity matters — panting cannot cool well when the air is hot and humid.
Frequently asked questions
Why is my dog panting at night?
Night panting with no heat or exercise is a red flag. It can signal pain, anxiety, Cushing's disease, or heart or lung issues. Book a vet exam, especially if it is new or paired with restlessness or gum-color change.
Is panting always a sign of heat?
No. Dogs also pant from excitement, stress, pain, and many illnesses. Context — what the dog was doing and whether it eases with rest — tells normal cooling from a problem.
Why does my short-nosed dog pant so much?
Flat-faced breeds have inefficient airways and overheat far more easily, so heavier panting is common and riskier. Monitor closely in heat or during exercise and avoid leaving them in warm enclosed spaces.
When is panting an emergency?
Frantic panting with gum color change (blue, pale, or bright red), collapse, or an inability to settle is an emergency — call the vet immediately. Heatstroke with these signs is life-threatening.