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Why Do Dogs Drool?

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(Image credit: analyser | sxc.hu)

Slimy saliva contains digestive enzymes that help canines (and humans) break down their food. Saliva also wets the throat for a smooth snack-slide right into the belly. But that all happens inside the body.

Drooling occurs when there's a saliva spill. It's simply biomechanics:

Some dogs, such as bulldogs and mastiffs, have such short snouts they have trouble containing their saliva and the leakage constantly pours out. Bow-wows with folded skin around their mouths, such as St. Bernards, bloodhounds and Bassett hounds, are also big drippers.

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Jeanna Bryner
Before becoming managing editor, Jeanna served as a reporter for Live Science and SPACE.com for about three years. Previously she was an assistant editor at Scholastic's Science World magazine. Jeanna has an English degree from Salisbury University, a Master's degree in biogeochemistry and environmental sciences from the University of Maryland, and a science journalism degree from New York University. Follow Jeanna on Google+.