Why Do Dogs Wag Their Tails?

Dogs use thier tail to tell you how they feel. A dog wags its tail when it is happy, just like you might clap hands to show you are pleased. Dogs use their tails to show other feelings too. A straight tail may mean that dog is angry or alert. A tailcurled between a dog's back legs means that it is afraid.

Our Dog Rover. :D

Jyoti (Tita Bames' Pet. )

A dog wags its tail when it is happy.

(via Google)

And to show you that it knows you are its master, it will roll on its back like this.

 (via Google)

(via Google)

When ity it is verry angry its tail will stick straight out behind it.

(via Google)

If it's suspicious or watchful or a bit angry, its tail stands up.