Instructions
Enter your Nintendogs in Disc Competitions, Obedience Trials and Agility Trials to earn money in the game. Winning these competitions will garner between $600 and $2,000 dollars. These trials also help build up your Trainer Points; you need 18,000 trainer points to unlock the Outer Space House.
Save the money you earn from your competition winnings; the Outer Space Home requires $100,000 in the game's money.
Train your dogs on a daily basis, even if you do not enter them in a competition on that particular day. Daily training regimens will build up your Trainer Points; obtain at least 18,000 so the Outer Space House will be available to you.
Purchase the Outer Space House. You will now be able to purchase more Nintendogs than the original limit of eight. Some of the dogs will have to spend their time between the Pet Hotel and any other homes you own in the game, but you will be able to interact with all of them on a rotating basis.