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One of my dogs does smile. It cracks me up every time I see her do it. Unfortunately, she doesn't do it on demand, so we never know when she's going to smile for us!
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Yes, i am sure of it. My dog "Zeus", smiles all the time. Mainly when he is upside down and i am scratching his belly :D
I could swear my dog smiles at me. Its really odd.
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