Icing In A Tube -A simple method of decoration is to use purchased icing in a tube. These icings typically contain sugar so use sparingly. Tubes are easy for children to work with.
Flavored White Chocolate Disks - Wilton Industries makes a line of white chocolate disks which come in a variety of colors including like red, green, pink, brown, and white.
The chips can be heated in the microwave or in the top of a double boiler on the cook top. We found using the double boiler more flexible than the microwave. You can add a teaspoon or so vegetable oil to make the mixture flow on more easily. Frosting can be spread or put into a pastry bag.
Doggie toothpaste - this is a suggestion we found on the web, we have not tried it.
White Chocolate - You may notice that white chocolate is a typical ingredient in many treat icing recipes. While chocolate is dangerous for dogs, white chocolate is safe. The reason being, most all the caffeine substance in white chocolate has been removed. White chocolate is primarily cocoa fat, sugar, milk solids, lecithin and vanilla with next to no "chocolate liquor" the substance hazardous to dogs. You may wish to read more about this in an article by K9 Magazine.
These can be used for doggie cakes or cookies and should be refrigerated.
From Three Dog Bakery
Blend thoroughly and spread on cool cake. Sprinkle with chopped pecans. The frosting contains carob, which is a safe chocolate-like flavor substitute for chocolate.
Cinnamon Vanilla variation: To the above recipe, add 1 teaspoon of vanilla, and 3 teaspoons of cinnamon.