Chocolate can indeed be toxic to dogs. In fact, it is one of the 20 most reported poisonings. The ingredient in chocolate that causes the toxicity is theobromine. The minimum toxic level of theobromine is 100-200mg/kg with 250-500mg/kg being the level at which half of the dogs would die as a result of consuming chocolate. So what does that mean as far as how much chocolate is toxic? The level of theobromine varies depending on the type of chocolate. The levels of theobromine are listed below:
Milk chocolate
60 mg/oz
Baking chocolate
450 mg/oz
Semi-sweet chocolate
260 mg/oz
Hot chocolate
12 mg/oz
White chocolate
1 mg/oz
Given these levels, 4 oz of milk chocolate contains about 240mg of theobromine. Considering that the average chocolate bar contains 2-3 oz of milk chocolate, it would take 2-3 candy bars to produce toxicity in a 10 lb dog. However, a single ounce of baking chocolate could produce severe toxicity in the same size dog.
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