Chocolate contains theobromine, a naturally occurring stimulant found in the cocoa bean. While the amounts necessary to poison your dog vary by type of chocolate, it's the theobromine that causes the danger to pets.

Check out this handy choco-chart showing toxicity amounts of different types of chocolate from Dog Owner's Digest. Included are important weights and amounts, making this a smart chart to print out. Calculate your pup's weight, fill in the blanks, and store in a safe place.

Type of chocolate 1-pound dog 10-pound dog 20-pound dog 40-pound dog ______ pound dog
White Chocolate 200 ounces 125 pounds 250 pounds 500 pounds ______ pounds
Milk Chocolate 1 ounce 1/2 pound 1 pound 2 pounds ______ pounds
Sweet Cocoa 0.3 ounces 1/6 pound 1/3 pound 2/3 pound ______ pounds
Baking Chocolate 0.1 ounces 1 ounces 2 ounces 4 ounces ______ ounces

The average chocolate candy bar contains two to three ounces. Dark chocolate falls closest to the baking chocolate estimations whereas semisweet chocolate falls in between milk chocolate and sweet cocoa.