Quick....before they're gone!!

These pretty little flowers are in a pot on the step at my back door....every year they come out and look lovely....briefly. Because within a couple of days the flowers are always lying on the ground Every year we wondered who kept nipping the heads off the flowers....we blamed birds....cats....even the kids.....until one day I saw Flynn, (the dog), sitting on the step blatently nipping the heads off two of my flowers!!! And for some reason every year he does the same thing! Weird!!