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Hello, my name is***** and I am happy to help. Given his breed (Cavalier), the panting and the tongue being darker, I'd be worried about heart disease. It would be best to have a thorough exam done tonight to be on the safe side.
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If they feel like they can't breathe, they won't lie down. They can't move their chest enough to move air and it makes them panic more. It could also be a fever, especially if a cool/wet shirt helped.
I wanted to follow up and see how Charlie Brown was doing?