I thought i'd add a little tip for dog owners (and even humans for that matter). Charcoal can help in a pinch. The unabsorbed Theobromine will bond to it and be excreted with feces. U can find such stuff at a first aid store. it will be activated charcoal, i think. Consult a vet, though, to see if there is a particular kind for dogs. In a REAL pinch, use burnt toast. And when i say burnt, i mean black as u can get it, without it crumbling the minute u touch it. I used the burnt toast thing on my own dog after she consumed an entire bag of hershey's kisses, as it would be an hour before the vet could have seen her. Just thought i'd add this as a helpful tip. Make sure u have the dog examined soon as possible though. http://www.virtualvet.com/petowners/poisonfacts.htm
is a link for more info.