How Much Chocolate Is Toxic for Dogs? Baking chocolate: Approximately 0.5 ounce for a 10-pound dog, 1 ounce for a 20-pound dog, and 1.5 ounces for a 30-pound dog all require a call to the vet. Baking chocolate includes Bakers Chocolate, Callebaut, Ghirardelli, Guittard, Lindt, Menier, Scharffen Berger and Valrhona.