Why he is smelling and then opening his mouth?

My 5 year old male Shitzu smells spots where my female Shitzu has been sitting. Then his mouths move open and closed for a few seconds out of time. Why does this happen can anyone please enlighten me?

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Jul 24, 2016
funny mouth monement
by: donna

I laughed when I read ur question because my male shihtzu does this and it is so funny! he does it when we have a female coming in heat. I've never seen another dog do this & I always thought it was quirky! And wierd looking, lol

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