For anyone who loves dogs canine body language is always interesting. If you’re new to dogs you can learn some important things from studying your dog’s body language. Here are some body language signals that will help you be more attuned to your dog. Most people first look to see if a dog is wagging his tail. This is often a good indicator of your dog’s mood — but not always. In fact, tail wagging has lots of different meanings besides happiness. Your dog can show lots of different moods with his tail, from happy wagging to holding it stiff and straight out from his body, ready to attack.