All forms of chocolate should be considered toxic to dogs, but some are worse than others. Should your dog gain access to chocolate, here is a chart that will give you an idea if you should call the vet or not.
Number of Ounces of Chocolate a Pet Would Need to Ingest for Toxicity
Weight of Pet 5lbs 10lbs 15lbs 20lbs 25lbs 30lbs 40lbs 50lbs 60lbs 70lbs 80lbs 90lbs 100lbs
Milk Chocolate
(ounces) 2 4 6 8.2 10.2 12 16.4 20.5 24.5 28.5 32.7 36.8 41_____
Dark Chocolate
(ounces) 0.7 1.4 2.1 2.8 3.5 4.2 5.5 6.9 8.3 9.7 11 12.5 13.8___
Baking Chocolate
(ounces) 0.23 0.5 0.7 0.9 1.2 1.4 1.9 2.3 2.8 3.2 3.7 4.1 4.6____