Do Dogs laugh, and do they smile?

We have a Pomeranian that we bought 3 years ago, and I am just curious whether Dogs laugh and smile. When his mouth is open, that does not necessarily mean he's smiling. It could mean that he's hot... I can determine whether he's happy or not by observing to his tail, but I don't know when he may be laughing or... show more We have a Pomeranian that we bought 3 years ago, and I am just curious whether Dogs laugh and smile. When his mouth is open, that does not necessarily mean he's smiling. It could mean that he's hot... I can determine whether he's happy or not by observing to his tail, but I don't know when he may be laughing or smiling.

How does one determine when a Dog laughs and smiles?

Thanks.
Dad
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