Think a wagging tail always means happy? Your dog may be saying something else - Hidden canine communication signals

A wagging dog tail does not always mean a happy dog. It can also signal excitement, stress, fear, or uncertainty. Understanding dog body language is becoming more important as millions of Americans share their homes with pets. Veterinarians and dog behavior experts say the tail is only one part of a dog's communication. Watch the ears, eyes, posture, and movement together.