While searching the web for a diagnosis for my hound I found a chocolate toxcicity meter. You put in the dogs weight, what kind of chocolate and how much he ate and the meter will tell you if he will be sick. Hope this link comes through. http://www.petmd.com/dog/chocolate-toxicity?icn=petMD- utility_bar&icl=3_choco_meter#.Ud8dPNLVDTo