ASnoopy is a copyrighted character, so you'll need to request permission from the copyright owner (go to www.peanuts.com and click the Contact Us link at the bottom) before you can legally recreate Snoopy on the cake. If they do not grant permission you'll need to buy a licensed figurine instead.
Jason, I've been thinking about doing a Snoopy cake for my son's birthday. I'm a hobby baker, not in business; do I still need to get permission to make a Snoopy cake? It will only be consumed by my immediate family.
AIf the cake will not be sold, transferred, or displayed publicly you do not need permission.
Quote by @%username% on %date%
%body%