To go back to a cub you no longer have in the bonding circle, just look for it's hut in Fur Town and select it from there.
The reason for so many huts is that there are a lot of different cubs (there's actually more cats than huts, which is why the pre-order cats are stored in the scan stone), som eof these are unlocked in-game, others are the various plush toys that you can buy and then scan into the game.
Michael