Una has always been a prissy sort of dog. For example, she is not interested in dog poop like many dogs I know. She is however very interested in dead things. Dead birds, dead bugs, a place where something dead used to be; all of these things will put her into a frenzy of rolling and rubbing. She wants to rub the stinky, stinky death all over herself. Joe hypothesizes that she uses the smell of death and vengeance to strike fear into the hearts of other dogs. I just think it is gross.