I found a few websites for you! They sound prettty good. If I were a dog, I would love to eat these cakes.
haha
http://www.foodfunandfacts.com/k9birthdaycake.htm
My brother has a lab mix and he buys doggy ice cream from Wal-Mart for his dog. He seems to love it! I believe it's all Pawsicles (?). I'm not sure, but they put it with human ice cream!