I must be a neglectful owner...I forgot a bag of Ghiradelli dark chocolate singles on the floor the other night, and came home from work the next day to find the bag empty and a torn-open wrapper nearby! Thankfully, there was only one square left, and Junebug seemed to be fine, if only a little more hyper than usual. I don't know what effect caffine has on dogs, but I swear she was on super-charge mode all night long. I'll be careful not to leave goodies around anymore!