Is my dog sick/have a fever?

Unusual symptoms:
-Warmer than usual
-Panting a bit
-Redder gums
-Coughing? Like, he keeps trying to cough something out his throat (like when a cat has a hairball)

Other things:
-Nose is not dry or warm per say
-Has his usual energy
-Doing regular activities without any problems
-Eating like usual

but it bothers me that he's "coughing", and hotter than usual...what is it?
 
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