Have you ever wondered why dogs like to have their ears rubbed? In the case of my dog, Maddy, when I rub her ears, you can almost see her eyes roll back into her head. It's almost like she's about to fall asleep.

Turns out the ears of a dog are one of three nerve centers on his or her body. The other nerve centers are between their toes, and the center of his or her belly; all of which are extremely sensitive to the touch.

Studies have shown that it’s not at all uncommon for a dog to slip happily into a state of "bliss" when their ears are being rubbed. What's happening is the stroking motion stimulates the pituitary gland which releases endorphins.

Veterinarians say a good ear-rubbing session is also an excellent bonding exercise for dog and man alike. In fact, humans experience many of the identical benefits that their canine companions do while they are enjoying each other’s touch.

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(Source: http://www.canidae.com/)