Firstly you need to have at least one creature with the creature breeder (horse, leopard, mandrill, or gorilla) then start the gold story scroll to proceed. Once completed you get to choose any creature from the Cow, Ape, and the Tiger. Choose and go to the creature breeder, once taught how to use the leashes. Then swap to any creature there and save the game then start a new game and choose another creature. Repeat the steps and eventually you should have the Cow, Ape, and Tiger with the creature breeder.