On the camera view of your dogs, tap the question mark under the dog's picture. It will bring up a screen with the dog's information on it, such as name, age, gender, etc. At the bottom is a button to go to the "Trick List". Tap on a trick, and tap "OK" for the dog to forget that trick. If you delete the trick by accident, you can re-teach the dog the same trick, and name it the same.