• cake mix; baked to form two circular cakes 
• frosting  
• Licorice for whiskers; M&M's for decoration 

You have two circular cakes, as though each would normally be one layer of a birthday cake.  
One is the head. The other is used the make ears and a bow tie.  
Cut the two ears out of either side of the circular cake, and then the center becomes a bow tie.  
Assemble the pieces, put frosting on it, and decorate it, making a face on it, etc.   
Use white frosting for most of it, and pink frosting for the center of the ears.   
Use licorice for whiskers, and put M&Ms all over the bow tie.