Fortunately, I have not seen that! Herding the dogs inside from under the mulberry tree has been an annual tradition in our yard in June for a number of years - since that stupid tree started dropping berries! We've always had labs......they'll eat anything.....doesn't matter if the berries are a nice ripe dark purple or if they are still white, if we don't pay attention, they'll gorge themselves on those berries.... now I need to find one on a stream bank!