Have to chime in on this one!! It's a tough stage! Bogey was the pits! I didn't wear shorts or short sleeved shirts for months because of all the bite marks!! We tried all the standard discipline measures: coins in a can, spray bottle, submission, and distraction. Some worked a short time, some not at all. Isolation was the ONLY thing that seemed to get his attention! Like @Vicaroo1000, abrupt end to playtime and into his crate for a time out was an immediate deterrent to bad behavior. I NEVER let him out if he whined. Only when he calmed down and sat quietly was he paroled! He usually fell asleep, and when he woke, he was a gentle loving pup. LOTS of praise for gentle kisses!! You may have to really guard your toddler during playtime, and separate them when you can't watch every move. When you see good behavior, there can't be enough praise!! The key is catching them in the act, and going with it!! As I said before, it is a tough stage, but itDOES go away!! Hang in there, and stick with consistency, routine, and gentle firmness. There is a gentle, loving bulldog under that shark skin!! Good luck!!!