Note: This game is also titled Bokujou Monogatari: Kira Kira Taiyou To Nakama Tachi.

Successfully complete the indicated task to unlock the corresponding animal:

Cat: Spend at least 30,000G at Massel's shop.
Dog: Get 5,000 animal degree points.
Horse: Get Mirabelle to 5,000 friendship points.
Pig: Ship 100 mushrooms after raising the Mushroom Island.
Special Chicken: Ship an "S" rank egg.
Special Cow: Ship "S" rank milk.
Special Sheep: Ship "S" rank wool.

The following is a list of islands you can raise, and the number of Sun Stones required:

Fruit Island: 10 Sun Stones
Greenhouse Island: 10 Sun Stones
Mushroom Island: 12 Sun Stones
Mystic Islands: 12 Sun Stones
Ranch Link Island: 3 Sun Stones
Rice Island: 4 Sun Stones
Volcano Islands: 8 Sun Stones
Wild Animal Island: 6 Sun Stones