Hello,,,as I mentioned before,,,we have a 8 week old GSD. It was early morning, I had no shirt on, carrying little Yeager to the patio door ,he looked up at me then clamped down on my nipple. Not the nicest good morning kiss I have ever had !!!! My wife laughed for an hour at me. I can;t wait till she gets it !!! I'm just useing a firm "NO" then try to have one of his 310 toys ready to hand him. We have two older dogs also , they take the majority of the abuse and sure let little Yeager know when they have had enough. Best of luck with your little snapping turtle. Have to love'em, your cup is only half full with out mans best friend .