Instructions
Select the "Go Out" button on the home screen and then select the "Walk" button.
Select the dog you wish to walk, then draw the desired route onto your DS screen with the DS stylus. Make sure your route passes over a blue "?" box.
Go on the walk. When you reach the blue "?" mark your dog will either bring you a present or interact with another dog.
Continue walking over blue "?" marks until your dog retrieves a record for you.