I believe that dogs have co-existed with humans for such a long time that they are able to eat anything that we can eat.

For sure some human food is not good for dogs. And I think dogs can eat chocolate although they shouldn't.

I know some writers (eg AdoreMyDogs) have provided evidence as to how dangerous chocolate is. However as a child, I used to share giant Easter-eggs and all sorts with my dogs and they were fine.

I am not saying chocolate is good for dogs. I am sure it is very bad for them. I just don't think it's dangerous.

Incidently, before modern treatments for worms, people used to feed their dogs onions.