Difficulty breathing is also called dyspnea and is a medical emergency.

Cat is open-mouth breathing – indicating severe respiratory disease
Short-nosed (brachycephalic) breed dog panting with cyanotic (blue-tinged) tongue

Respiratory distress is recognized by increased effort to breathe; noisy or squeaky breathing; cyanosis (a bluish tinge to the lips and mucous membranes); and an inability to inhale or exhale. In cats, breathing with the mouth open (panting like a dog) is a sign of severe distress and should be evaluated by a veterinarian right away.

It is imperative to get the pet examined to determine the cause. Diagnostic tests (such as x-rays, blood tests and ultrasound) will be needed, but the pet must be stabilized (often with oxygen or by removing fluid from the chest) before they can withstand the rigors of testing if respiratory distress is severe.

What to Do

Brachycephalic (short-nosed) breeds (e.g., bulldogs, Pekingese, Pug, etc.) warrant a special mention. Because of the short nose, the soft palate can interfere with breathing. On hot days or in hot environmental conditions these dogs try to cool off by panting vigorously, and the soft palate interferes even more. This cycle continues until the dog is severely dyspneic and overheated. Cooling these dogs is imperative. Move them to a cool environment and seek immediate veterinary care. This syndrome is manageable only by protecting these breeds from heat or by surgically reconstructing the soft palate.

What NOT to Do

Dyspnea, or difficulty breathing, is a serious sign. Causes include:

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