I have been trying all these tips on pocket edition but you can not cheat with spawn eggs. I don't have any cows and I want to make a cake. Can any one help me? I have searched the whole world but there are no cows.
Because the space in the world is limited, "animal spawn control" might help you in this situation.
This means removing or placing blocks on top of all dirt blocks on the surface of the world (removing the grass) except in a fixed area. It will increase their spawn rate and make them all spawn there.