Below is a list of pets in the game and how you unlock them.
Buy in Snow Store.
Buy in the Peasant Store.
Buy in the Volcano Store.
Buy in the Church Store.
Found at Thieves' Forest by the river.
Found in the Marsh.
Found at the Industrial Castle.
Found at the exit of Forest Entrance behind a bush.
Unlock Mr Buddy:
Dug up in the first map on the left side.
Dug up at the beginning of Medusa's Lair.
Dug up by the first graves at the Marsh.
Dug up in the desert before you reach the Alien Ship.
Bomb the wall in Thieves' Forest.
Bomb the wall at the Sand Castle Interior.
Unlock Bitey Bat:
Found when you have killed the boss Pipistrello.
A miniboss bear has him at Tall Grass Field.
Bomb a cracked wall early at the Cyclops Fortress.
When you are at Tall Grass Field blow the horn by the first group of tents.
At the end of Snow World hidden behind a house at the bottom of the hill.
Unlock Bipolar Bear:
At the end of Snow World blow the horn near the entrance of the Ice Castle.
Far left of the Animal Ark above the locked door (to get him use Magic Jump).
Catch and kill the Saracen on a camel during Desert Chase.
Added by: Sanzano Sep 2nd 2008, ID#3046