our white dog has a turtle obsession

Beaufort, our white (mutt) dog has become totally obsessed with these turtles.  I'm guessing they are snappers, but he hasn't confirmed this yet.  Every time he finds one, he start barking, circling, etc.  This morning, he started turning every one he could find upside down.  (I'm thinking they can't right themselves?).  I followed him around, turning them back over, and putting them back in the creek for an easy get away.  Who say's there's nothing to do down here in Alabama??!

Robin Wade