Diane's comment about pork prompted me to look for more information. I found this link:

http://www.swallowsnest.com/dog_health.html

It includes foods like chocolate, pork, and avocado (?) as well as plants they shouldn't eat. There are some "duh!" things on there too, like jimson weed and marijuana. I can't vouch for its accuracy, but it's a good starting point, anyway