I think we need to hear more about this story!
On a control close to the road, a really loud dog came from a house across the road and started up the hill to where we were. Then to the "don't eat the mushrooms" control, another dog at the cottages came out and was barking and following us for a little, so I guess not really vicious.
The "don't eat the mushrooms " must have been unique to the long course.
It was on a play ground, and in the play ground there was a table with 4 stools around it shaped and painted like a mushroom.