What do blue mucous membranes indicate?

• A. Hypoxia
• B. Jaundice
• C. Dehydration
• D. Hyperthermia

Answer: (A)

Blue mucous membranes indicate hypoxia, meaning the tissues aren’t getting enough oxygen. The blue color, or cyanosis, occurs because blood near the surface is more deoxygenated, so the mucous membranes appear blue rather than pink. This is a serious sign of respiratory or circulatory trouble, such as breathing difficulty, airway obstruction, lung disease, heart problems, or severe circulation issues. In a normal dog or cat, mucous membranes should be pink; pale membranes can mean anemia or shock, while jaundice would be yellow and dehydration makes membranes dry and lighter rather than blue. If you see blue membranes, recheck in good light, assess breathing and perfusion, and seek urgent veterinary care, providing oxygen if you’re trained and able.