To add more air to the Giant Balance Disc, use an air pump with a cone-shaped attachment. On the side of the disc, you will see a white plug that will need to be removed before the air will go in. Place the tip of the cone shaped attachment in the hole, inflate and replace the plug firmly to hold the air inside.
To remove air from the Giant Balance Disc, simply remove the white plug from the side of the disc and let out desired amount of air before replacing plug firmly.
The more inflated the Giant Balance Disc is, the less it will move when your dog is on top and the less challenging it will be. The less inflated the Giant Balance Disc is, the more dynamically it will move and the more challenging it will be.