Why is chocolate poisonous?
There are 2 natural substances inside the Cocoa Tree that are harmful to dogs - Theobromin and Caffeine.
Dogs metabolise theobromine very very slowly. Its been known to stay inside a dogs bloodstream for up to 20 hours. In that time it interferes with bodily functions that maintain the central nervous system that in turn affects the kidneys and heart.
Lethal doses for a 10lb dog - Roughly 7oz of milk chocolate, or 3oz of instant cocoa powder. just over half an ounce of dry cocoa powder, or 10z of unsweetened baking chocolate.
Lethal doses for a bigger dog say 70lbs - approximately 3lbs of milk chocolate, or 4oz of cocoa powder, or 1.3lbs of instant cocoa powder, or 7oz of unsweetened baking chocolate.
Picture provided by www.chocolate-world.net/
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