My Dog Drank My Choc Milk!
Joe, our son's Jack Russell got into an entire bowl of Hershey's Kisses last Christmas and blew up like a balloon from the chocolate. They rushed him to the vet and had his stomach pumped. It all turned out OK.
The vet told them more than 10% of the dogs weight in chocolate is the danger line - doesn't matter if milk chocolate or dark chocolate.
Best bet is to keep all chocolate away from them just to be on the safe side.
Just like kids - you got to keep an eye on them all the time. Glad it turned out OK.