I have a dog named Bubba who is about 4-5 Years old and she is very protective and very jealous of me and my new dog Cujo. Bubba knows she can't stay inside the house because she makes a lot of mess so we let her stay outside even though she is a house dog. She seems to like it more outside, but whenever Cujo barks she starts crying because she wants attention but she doesn't like Cujo at all when I go outside she smells me right away. Also whenever Cujo's at the door, Bubba barks at him and tries to attack him. How can I make Bubba learn to love Cujo?