Milk chocolate can be toxic if your dog eats 1 oz to 1 pound of body weight. semi-sweet chocolate can be toxic if your dog is 1 ounce per 3 pounds of body weight. Bakers chocolate can be toxic if your dog eats 1 ounce per 9 pounds of body weight. On the basis that 3 ounces of Bakers chocolate can be harmful to a dog 25 pounds