A very very huge chocolate cake

Micha wants a chocolate cake for his birthday - but he wants a rather special chocolate cake. He wants an enormous cake, one with many layers and chocolate sauce on top. He is so vocal about it that he becomes a nuisance. Happily, the Doggies will not hold a grudge. Once Micha has fallen asleep, they sneak out of bed and secretly bake an extraordinary cake. But on the next morning, Micha is nowhere to be found! Where could he possibly be? One just does not disappear on one's birthday…