How toxic is chocolate? It depends on the dog and the chocolate. White chocolate is least toxic, Baker's (unsweetened) chocolate is considerably more toxic. Small dogs don't have to eat very much to see the earliest effects of vomiting and diarrhea.
I wanted to share a handy interactive chocolate chart that I found at National Geographic. This will help viewers visually understand "how much is too much" relating to the size of dog and type of chocolate.
Photo credit: Chocolate chunks © Getty Images / Mark Weiss