You probably already know that a dog’s tongue is part of their body’s cooling system. Dogs don’t have sweat glands like humans, so they pant to cool down.
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According to PetMD.com, if your dog’s tongue is normally pink, a sudden color change may indicate a medical emergency.
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A dark red, purple, or blue-tinged tongue could be a sign of heatstroke, toxin exposure, heart/lung disease, or electrical shock.
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A pale pink-to-white tongue could be a sign of severe anemia due to immune mediated disease, or internal bleeding.
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If you notice these changes in your dog’s tongue, call your vet right away.