Correct!
The answer is: Baker's Chocolate (also known as unsweetened chocolate)
From
the Chocolate Toxicity FAQ:
Chocolate is made from the fruit (beans) of the cacao tree. Theobromine, a component
of chocolate, is the toxic compound in chocolate. (Caffeine is also present
in chocolate, but in much smaller amounts than Theobromine.)
Unsweetened (baker's) chocolate contains 8-10 times the amount of Theobromine as milk chocolate. Semi-sweet chocolate falls roughly in between the two for Theobromine content. White chocolate contains Theobromine, but in such small amounts that Theobromine poisoning is unlikely.
Quick Guide for
Theobromine levels in different types of chocolate:
From The Merck Veterinary Manual, 8th edition
* Unsweetened
(Baker's) chocolate = 390-450 mg Theobromine per oz chocolate
* Milk chocolate = 44-60 mg Theobromine per oz chocolate
Semi-sweet is a bit less than half of the Theobromine content as Baker's chocolate. White chocolate contains Theobromine, but in such small amounts that Theobromine poisoning is unlikely.
Related question
of interest:
Why isn't
chocolate toxic to humans?
Humans can break down and excrete Theobromine much more efficiently than dogs.
(Thank goodness for that!)
Related Q &
A:
Chocolate
Toxicity
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