The amount of chocolate that is dangerous for dogs depends on the type of chocolate, the size (weight) of the dog, and the concentration of the toxic compound theobromine in the chocolate. Darker chocolates like cocoa powder, baking chocolate, and semisweet chocolate contain more theobromine and are more toxic than milk or white chocolate. Here are some specifics:

• Even small amounts like 0.1 ounces (around 2.8 grams) of baking chocolate per pound of body weight can cause severe symptoms.
• For milk chocolate, about 0.5 ounces per pound of body weight may cause significant toxicity.
• For dark chocolate, around 0.13 ounces per pound of body weight can cause poisoning.
• White chocolate is the least toxic but can still cause stomach upset due to fat and sugar content.

For example, a 30-pound dog can have mild toxicity starting from as little as about 2-5 ounces depending on the chocolate type (much less for baking chocolate and more for milk chocolate). Symptoms include vomiting, diarrhea, tremors, rapid heart rate, seizures, and can be fatal. It is always advised to contact a veterinarian immediately if a dog consumes any amount of chocolate, especially dark or baking types.