Coughing can also be a sign of congestive heart failure, so for sure I'd be getting your pup to a vet pronto for a diagnosis.
Good luck! And let us know what you find out.
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"To close your eyes will not ease another's pain." ~ Chinese Proverb
“We must not refuse to see with our eyes what they must endure with their bodies.” ~ Gretchen Wyler
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