Felicia, depending on the situation there are several things you can start doing. If you are playing with him…stand up and walk away, play stops immediately. You can place him a crate away from everyone until he calms. When u say he is chomping with his mouth. Are you referring to air bites? Some pitties do this. You have to become the leader of the pack. Always supervise dogs when together. Exercise, socialize. Did you do a two week shut down when you got your 2nd dog? Check out http://www.pbrc.net on multi dog homes, NFL as well as crate n rotate. Congrats on your new pup. Good Luck
