If you have played any of the old Nintendogs games don't buy the dalations one 'cause there is nothing diffrent and you get the spotty dogs in the other games.
I didn't even know they were coming out with Nintenpuppies and/or Nintenkittens.
I imagine they would be very much alike, with only a few differences. Think back to the Dogz/Catz/Petz games that have been out for PC...they were basically improvements on one another.