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Most people associate a yawn with being sleepy, tired or bored. But a yawn is just a impluse to inhaling air extendin your eardrums and exhaling.
http://answers.ask.com/Health/Diseases/what_is_a_y...
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Dogs yawn for the same reasons why people yawn. They yawn when they are tired, they yawn when they are bored, they sometimes yawn when they are embarrassed. Look here for more information
http://answers.ask.com/Science/Nature/why_do_dogs_...
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Causes of you to yawn have been studied and not conclusive but can mean you could be hungry, or could depend on our mood. Another cause that is said that it can be to cool off the
http://answers.ask.com/Health/Diseases/what_causes...
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There is no scientific answer on why we yawn. Some think it may be caused by being bored or sleepy but is considered an involuntary response.. In fact, even babies yawn before they
http://answers.ask.com/Health/Diseases/what_causes...
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