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Dogs and Chocolate: Get the Facts

Most of us have heard that chocolate can make dogs sick. But how serious is the risk?
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Dogs and Chocolate: How Much is Too Much? continued...

Unsweetened baker's chocolate contains about 390 milligrams of theobromine per ounce -- about 10 times more than milk chocolate and more than twice as much as semi-sweet chocolate. White chocolate contains very little theobromine.

According to the Merck Veterinary Manual, one ounce of milk chocolate per pound of body weight is potentially lethal.

But the real danger lies with dark chocolate. Merck warns that deaths have been reported with theobromine doses as low as 115 milligrams per kilogram (2.2 pounds) of body weight.

So 20 ounces of milk chocolate, 10 ounces of semi-sweet chocolate, and just 2.25 ounces of baking chocolate could potentially kill a 22-pound dog, Fitzgerald says.

Serious toxic reactions can occur with ingestion of about 100 to 150 milligrams of theobromine per kilogram of body weight.

That means:

  • A 9-pound dog could be expected to show symptoms of chocolate toxicity after eating 1 ounce of baking chocolate, 3 ounces of semi-sweet chocolate, or 9 ounces of milk chocolate.
  • A 27-pound dog might have such symptoms after eating 3 ounces of baking chocolate, 9 ounces of semi-sweet chocolate, and 27 ounces of milk chocolate.
  • A 63-pound dog might exhibit symptoms after eating 7 ounces of baking chocolate, 21 ounces of semi-sweet chocolate, or 63 ounces of milk chocolate.

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