In Happy Pets, you can chuck all your items in spare rooms at your pets' home, or maybe even in a spare yard, but those are supposed to be places your pets can live and play in. So we were gratified to learn that the game is finally introducing storage space in the form of attics, with the caveat that you can't keep your pets in there. But this offer isn't going to come cheap.
To unlock the attic, you'll need 25 neighbors and 300 Coins, or you can get it for 10 Facebook Credits. The game is definitely setting us up for the FB Credits option, because 25 neighbors isn't that easy to come by. It's a strange thing though, for something as basic as storage space to remain an exclusive option for players. But given that spare rooms and yards are still a simple solution to the issue, I doubt anyone's going to feel pressured into buying an attic.