TL;DR: Blue, purple, or grey gums (cyanosis) indicate a life-threatening lack of oxygen and require immediate emergency veterinary care. Do not wait for an appointment; transport your dog to a hospital now and call ahead while en route.
What is cyanosis and why are my dog's gums turning blue?
When a dog's gums turn blue, purple, or slate grey, it is a medical condition called cyanosis. This occurs when there is an insufficient amount of oxygen being carried by the red blood cells. Healthy gums should be a bubblegum pink color; any deviation toward blue indicates that the body's vital organs are being deprived of the oxygen they need to function.
Are blue gums in a dog a life-threatening emergency?
Urgency Level: High. Yes, this is a critical, life-threatening emergency. Difficulty breathing (dyspnea) combined with blue gums suggests that your dog is in respiratory or cardiovascular distress. Please follow these immediate instructions:
- Do not wait for an appointment or monitor the situation at home.
- Transport your dog to the nearest emergency veterinary hospital immediately.
- Call the clinic while you are on the way so they can prepare an oxygen cage and a triage team for your arrival.
How can a photo or video help the vet triage my dog?
While your primary focus should be getting to the vet, having visual documentation can be incredibly helpful for the veterinary staff for the following reasons:
- A clear photo of your dog's gum color or a short video of their breathing pattern provides a baseline of the peak distress level.
- Because gum color can change rapidly or may be affected by the stress of arrival, a photo helps the vet see the symptoms as they first appeared.
- This allows the triage nurse to quickly categorize the severity of the crisis and prioritize your dog for immediate life-saving stabilization.
Clinical Context (Merck Veterinary Manual)
Compromised breathing in dogs manifests as increased respiratory rate and effort, followed by changes in respiratory pattern and postural changes such as standing with elbows abducted and back arched. Labored, open-mouth breathing and cyanosis indicate significant loss of pulmonary function and impending pulmonary arrest. Cyanosis and anxiety are often present with partial large airway obstruction, and loud referred airway sounds may be heard throughout the thorax on auscultation. Potential causes of large airway obstruction include foreign bodies, edema, laryngeal paralysis or paresis, tracheal collapse, elongated soft palate, aspiration of stomach contents, neoplasia, and pharyngeal hematomas. In severe, life-threatening situations, the animal is cyanotic, open-mouth breathing, collapsed, and asphyxiating, potentially due to anaphylactic reactions or bronchial obstruction. Unconscious, apneic animals require immediate tracheal intubation.
Chapter: Emergency, Anesthesiology, Respiratory
Source: The Merck Veterinary Manual, 11th Edition (Page 1662)