Hal sometimes smiles. Is it really a happy smile?

If the weather is not very hot, when Hal has a smiling expression, it is a happy smile.

Because when the weather is hot, Hal will stick out his tongue to dissipate heat. When he sticks out his tongue, his expression looks like a smile, which may not be a happy smile. But when the weather is not hot, the dog will stick out its tongue and smile. It must be because he is a little tired when playing that he is in a good mood. This smile is a happy smile.

Dogs, like people, have their own set of expressions. Are you unhappy? Sometimes I don't want to laugh, but I show an unhappy expression.