Here's Why Dogs Kick Their Legs When You Rub Their 'Sweet Spot'

Fido just can't help himself. Each time you scratch that sweet spot on his belly, his hind leg starts kicking like crazy--but why?

Ultimately, it's all about self-preservation.

"Dogs kick when we scratch their belly because it's an involuntary reflex," Dr. Marc Bekoff, a canine expert based in Boulder, Colorado, and author of the book "Why Dogs Hump and Bees Get Depressed," told The Huffington Post in an email.

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