I’ve kept this topic for last, on purpose. So many myths have been bandied about on this issue. Practically every ‘sudden’ canine death is attributed to a frog ‘blowing’ on the dog. Usually, there is a different cause of ailment and death, another reality.
The fact of the matter is that all toads have a bad taste and usually dogs keep far from them. I suppose there is some maternal teaching mechanism that plays a role,