When you complete the following tasks the corresponding pet will become unlocked.
Go to the Frogzard Hunter, click 'Dinozard Island' and complete the quest.
Found at Gatta Island.
Unlock Light wolf:
Go to werewolf lair at Darkovia Forest and find the yellow wolf.
Keep battling monsters until you face Lord Arrgthas then defeat him.
Unlock Random Wild Animals:
Keep battling at the 'Battle Monsters' sign until you end up with a crate.
Purchase Feral Garb at Dark Jungle.
Unlock Thunder Kitten:
Complete the quest at Thunder Mountain.
Purchase at Aria's shop.
Added by: Sanzano Dec 21st 2010, ID#15662