My puppy, Zero, gets VERY excited when he sees new people and I meant VERY excited. Whenever Zero sees people, Zero jumps around, runs, licks, wags his little stub like crazy, and this behavior goes on. When my brother came over yesterday, Zero was so excited, he had an accident on my brother... How do I control his excitement? Or how can I tone it down? He is under four months, will he grow out of it?