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Dogs can 'taste' scent. It's called Flehmen. By chattering the teeth, they are gathering the scent into the Jacobson's organ located on the roof of the mouth to 'taste' it, concentrating it, to get a better 'picture' of the animal or object they are sniffing. Sometimes it can get really intense causing saliva to drip or foam along with the chattering. Ultra excited as in a female in heat. Both males and females do it.

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Q: Why does a dogs lips quiver after it tastes another animal's or dog's saliva or blood?
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