That happened to my RB Pepper, a 6 pound Poodle. The first Christmas we had him he got up on the sofa table and ate all the Hershey's Kisses. We didn't know who ate them and my parents and brother and I all blamed each other until a day later when I was outside with Pepper when he pottying and I saw shiney red, green and silver in his poo. That was pretty funny!!

I had always heard chocolate could kill a dog but he was absolutely fine, with pretty colored poo.