[BillyMac]

I've never used the "official" bird dog signal (arm outstretched, palm down, point to hip) to identify the shooter (just the player who fouled, as an option). If the shooter is obvious, I do nothing. If the shooter is not obvious, I will make eye contact with my partner, point to the shooter with a traditional, garden variety, pointing gesture, and state, "Shooter", to my partner.

Since we began not shooting team control fouls several years ago, and now with throwin fouls considered team control fouls, the non-obvious shooter on a screening foul doesn't come up any more, so the shooter is often more obvious than in the past.