How do you get a puppy to go to the agility on Nintendogs ds?

First you go for a walk with the dog you want to train, then draw a route to the training center in the bottom right (I think it's in the bottom right) and then walk there. You should wait until you have enough walk lines (for when you draw your walk out) to be able to get at least 1-2 presents and go to a store or field in one single walk before the agility training. Once you get there instructions will be provided for you. Have fun! (Note: The more contests you enter each time you go back there will be more obstacles and new ones will be added as you level up)