We've all heard the horror stories about dogs and chocolate, but rarely anything other than "it's poison to dogs." Finally, I ran across an article that explains it and will dispel some of the panic if we find out our dogs have snuck off with the last piece of that Hershey bar or a stolen bite of brownie.
http://www.petplace.com/Articles/artShow.asp?ArtId=602
http://www.petplace.com/Articles/artShow.asp?ArtId=602