Pete has always been pretty vocal but recently its gotten out of control. When the doorbell rings he goes running to the front of the house YELPING. Its the worst high-pitched yapping bark that sounds like fingernails on a chalkboard. He also barks a lot in the backyard. When he gets going our other dog starts barking they egg each other on. Greeting guests is excruciating, it becomes more about the dogs than the people. How do I train them to be calm and not bark or rush the door at the sound of the doorbell?