Why do dogs wag their tails?

Answer: Shows different emotions

Shows different emotions ✓ — Correct! Tail wagging shows various emotions. A relaxed, wide wag means friendly. Fast, stiff wagging can mean arousal or aggression. Direction matters: wagging right often shows positive feelings, left shows negative. It's body language we can read to understand their mood!

To cool down their body — Wrong. Dogs don't wag their tails for temperature regulation. They cool down by panting and through paw pads. Wagging is purely for communication of emotions and intentions.

Keep flies away — Wrong. Dogs don't wag their tails to keep flies away. That's more common in horses and cows. Dogs wag specifically to communicate emotions and intentions to other animals and humans.