DLTK's Crafts for Kids
Doggy Paw Print Birthday Cake

You could also do a white one with chocolate toes for a Dalmatian puppy or snoopy theme.

Materials:

• favorite cake mix -- one box (or two boxes if making two pawprints)
• favorite icing (I just use the kind you purchase) -- white icing + food coloring for all the cakes except scooby doo.  For that, I just use chocolate icing.
• Food coloring drops or paste (paste gives brighter colors
• regular round cake pan
• cupcake pan

Instructions:

This cake is very simple.  It's one round cake and 4 cupcakes all frosted with an appropriate color and arranged like a pawprint (see photos below).  You can make two of these cakes, depending on how many children will be at the party. Another nice thing about it is that you can make the cupcakes a different flavour than the main cake for variety.