TL;DR: Open-mouth breathing in cats is a life-threatening medical emergency indicating severe respiratory distress; seek immediate veterinary care if your cat is panting while at rest.
What does it mean if my cat is breathing with its mouth open?
Open-mouth breathing in cats, often referred to as panting or dyspnea, occurs when a cat utilizes their mouth to move air because their nasal passages or lungs are not providing enough oxygen. Unlike dogs, who pant to cool down, cats are obligate nasal breathers. If a cat is breathing with their mouth open while in a relaxed or resting state, it indicates significant respiratory distress.
Is open-mouth breathing in cats a veterinary emergency?
- Open-mouth breathing while resting is a high-priority medical emergency.
- Because cats hide signs of weakness, visible difficulty breathing suggests their compensatory mechanisms have failed.
- Potential causes include heart failure, feline asthma, fluid in the chest, or severe infection.
- Transport your cat to the nearest emergency veterinary clinic immediately.
- Keep the carrier level and the car quiet to avoid putting extra stress on the cat during transport.
How can a photo or video help the vet triage my cat's breathing?
- If safe and quick, capture a 10-second video of your cat's breathing to provide life-saving information.
- A video allows the triage team to see the exact rhythm, frequency, and use of abdominal muscles.
- This visual evidence helps the medical team determine the severity of the crisis immediately upon arrival.
- Providing a video can potentially fast-track your cat to an oxygen cage for stabilization.
Clinical Context (Merck Veterinary Manual)
Compromised breathing in cats manifests as an increased respiratory rate and effort, followed by changes in respiratory pattern and postural changes where the cat may sit crouched on all four limbs with the sternum slightly elevated. Labored, open-mouth breathing and changes in mucous membrane color (gray or blue, indicating cyanosis) develop last and indicate significant loss of pulmonary function and impending pulmonary arrest. Cyanosis from small airway obstructive disease is treated by providing oxygen by flow-by, hood, or nasal cannula and sedation with a narcotic-tranquilizer combination. If cyanosis and decompensation persist, or the work of breathing is profound, intubation and positive-pressure manual or mechanical ventilation with 100% oxygen is necessary.
Chapter: Emergency, Respiratory
Source: The Merck Veterinary Manual, 11th Edition (Page 1663)