I have a vintage lamb cake mold which calls for a Dromedary brand (I think
that is what it was) pound cake mix. You fill up the bottom half with batter, put the top
half of the mold on, and the cake rises to fill it completely. I probably used it at least a
dozen times (for Easter cakes, mostly) and it worked beautifully every time.
I don't know if that brand mix is still available.

N.