We just adopted a 1yr old, Beagle mix 4days ago. He is smart and responds well to obedience training. We were advised that he was good with kids and would make a great family dog. He came from a shelter in the south and is neutered. He is rough with my kids. Will knock them down and mount them any chance he gets. He also tries to hump them when he's excited. (he's neutered). My 2yr old is scared of him. He hasn't bitten or growled, he has snapped but not made contact. It seems more playful than aggressive but I can't be certain. Is this normal puppy-ish behavior? I'm worried it's going to escalate. Thanks!