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Heavy breathing after activity is perfectly normal.
Most dogs have pink tongues, but some breeds such as the Chow chow and Shar Pei have blue-black tongues and it's totally fine.
Usually, when the dog's tongue becomes pale blue, it's a sigh of a lack of Oxygen in the blood, which happens because of suffocation or breathing problems. This condition is called cyanosis. If your dog's pink tongue and gums often get blue with no obvious reason, I'd recommend a visit to a vet as soon as possible.
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