
Well I have to admit my dogs DO get birthday cakes. :D But I do it plain and simple. Some nice canned food, a tray of Cesar is perfect because you can tip it upside down on a plate. Cover it with chocolate drops and stick chews in as candles. :D
In the past though I have also used pie shells that you can fill yourself, and filled it with some nice meat, again covered with choc drops and added candles. That kind of cake can be cut and shared between dogs.