I found an article from a Pet poison hotline
Apparently they say the darker and less sweet the chocholate, the more dangerous it is
So lets take White chocholate, milk chocholate, a chocholate chip cookie, and some M&Ms, and bakers chocholate
According to the Darker = Badder principal,
Some White chocholate wont have any serious effects
Milk chocholate will have some more effects but shouldnt be too serious
Dark chocholate is something to worry about
1 or 2 bites of a chocholate chip cookie, as long as its not dark chocholate could be a bit dangerous
M&Ms have milk chocholate so try and hide them from your dog
Now Bakers chocholate.... if your dog eats any of this stuff, haul his ass to the vet ASAP
heres the article
http://www.petpoisonhelpline.com/2011/07/is-chocolate-poisonous-to-dogs/