On Club penguin for nentendo ds how do you make the black puffle happy?

It is a grumpy puffle. Really, it is never happy. Even if all its bars are full, it never is happy. Sorry. Get a blue one. They are always happy. (I have one.) Good luck! =)

On the DS game, you have to get a postcard and then talk to all the penguins you come across. The ones who are the black puffles friends need to sign the postcard. You take it out of your suitcase and click on the penguins to get their signature. Once they all sign it, you go back to the dojo and give the postcard to the black puffle.