The Canine Caper

I called the dogs in after their romp in the backyard last Saturday and found this:Yes that is a big chunk of Jackaroo's face missing. Gives him a rather rakish look don't you agree?
He doesn't seem to mind much as you can see from his smile. I tried to get to the bottom of this incident but after a session of questioning all the involved parties refused to talk.
Though I have my suspicions...
So innocent looking. Uh huh.