i believe it was milk chocolate with peanut butter. i didn't take him to the vet because he didn't have a reaction. i have a candy bowl on my coffee table and it's had chocolate in there for almost 6 months now. He never touched then before so i don't know what made him want to try it now. Needless to say i have emptied the bowl. Oh and yes cookiemonster, i cook with carob. i didn't know it was safe for dogs tho.