I don't know about you, but if a neighbor said, "You oughta see my dog fire my gun. It's a hoot and a holla!" I'd be running for cover. I'm not fond of dogs with firearms in their mouths. Don't ask me why, it's just one of those things like lima beans. I don't like 'em.
If'n I was one of them thar birds in the pen I'd be movin' fast at the first click of that dog cockin' that gun. Maybe it's just me. Perhaps in some circles dogs doing target practice is considered normal.