Why does the bottom lip of your dog quiver?

Answer

He is making a solution of the air and his spit, so that he can better detect what is in the air. It's totally normal.
Q&A Related to "Why does the bottom lip of your dog quiver?"
Your lips quivering can betray anxiety or simply be an unwanted discharge of electricity
http://www.chacha.com/question/why-do-lips-and-eye...
maybe lack of sleep, fatigue, or nervousness.
http://answers.yahoo.com/question/index?qid=201202...
Not Medical Advice: Lip quivering or twitching may be caused by stress, fatigue, emotion and excessive caffeine intake. See MD if it worsens.
http://www.kgbanswers.com/what-is-a-quivering-bott...
Explore this Topic
Quivering lips might be caused by a variety of nervous disorders. These can include things like Parkinson's disease or trauma to the head or brain. Other causes ...
A quivering lower lip can be a symptom of a muscle spasm. The issue can also be caused from nerve damage. If the quivering continues, consult your doctor. ...
An example of a sentence that has made use of the word quiver is, 'When she heard the bad news, her lips started to quiver.' Quiver is a term that is used to describe ...
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