I found this interactive chart awhile ago and posted,but i felt the need to do it again.
If on Christmas morning you fur butt gobbles up a chocolate ball don't panic right away. This chart tells you how much chocolate our dog can eat (by weight) before they vomit,have rapid heart beats, tremors and seizures and die.
if you lose this thread dont worry the chart is in the library,I just know some newer members may have never needed the library and would not to look.
The Chocolate Chart Interactive - National Geographic Magazine