NO NO SUGAR....lol wot i did for my was, I baked a pot pie, took it out the pan/fliped it over baked it alittle more, than made some egg salad put it in the blender a made some frosting......an wow she was happy!!!
Beaten egg (Meringue)would also make a good "frosting".
A friend of mine owns a "doggie daycare". Her pup and another that goes to the daycare have the same birthday. Here are Cheyenne(the GSD) and Sassy with one of their cakes. (The cakes were made by Sassys owner.) Cheyenne was ALL ABOUT the CAKE, Sassy was more into all the TOYS!