Once your Egg has hatched, your Dragon will emerge and be ready to grant you with Perks while you play.

Increase to the Hourly Bonus
Once your Perks are activated, your Dragon will increase the amount of coins you receive when claiming your Hourly Bonus. The increased amount depends on your Dragon’s level and how well fed your Dragon is.
Dragon Respin
As you spin, your Dragon has a chance to turn a losing spin into a guaranteed win! The likelihood of getting a respin depends on your Dragon’s level and how well fed your Dragon is. At higher levels, your Dragon will also award you extra House Points with each Dragon Respin!