From what I’ve heard, foxes open their mouths and scream a bit to say they’re happy and excited (but also to protest and defend their things and territory!!)
Dogs obviously don’t smile either.
Their jowls can droop to look like it, but they mostly open their mouths to either pant to cool off or release stress, show submission, bark or bite.
So while no canine animal actually smiles like we humans do, foxes still come pretty close to it. ♥️
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