Oh wow! That is very scary. I think mine is one that would have gobbled it up.
We had an incident once, where family members "thought" they gave their dog their ACE for their travel home. About 30 minutes after they left I realized my Mylee was very very groggy. I am positive their dog didn't get their meds and my Mylee did. Thank goodness their dogs are in the 10-20 lb range and it was a low dose for them, but enough to make Mylee extra groggy. Your warning is a good one to be vigilant about.