Dog Treat Icing Recipe

I am getting ready to go into the Gourmet Dog Bakery business and have yet to find a good recipe for the frosting to decorate my treats. I need it to dry hard and smooth. I tried Royal icing but after it hardened I packaged the cookies only to find the icing was coming off the cookie. Right now I am using the white melting chips, but I'm not happy with it. Thank you so much! Kirsten

Chef's Answer ~ Starting a new business is so much fun, and yet still filled with frustrations! :) I would recommend checking out the dog treat icing mixes at K9 Cakery.com. They also have lots of other decorating and dog treat baking supplies that may come in handy.