Part of the Blackus family, grassus flyeatus generally is short lived. Most likely due to the dietry habits of the dog and dog owner in question this fellow is a favourite of the flies.
You may just make out the fly in the top left hand corner of the poo. Unfortunately I had disturbed the little guy during lunch when I arrived and had to settle in before he came back.
I felt that to catch grassus flyeatus in action would be a fine addition to the collection.
Other names: England - Romanus Prunus / New Zealand - Isit edibilis