Our Jack Russell that we adopted a year ago just loves us to death! Except at night when he becomes protective of my wife and outright hostile to me , barking and growling at the sound of my footsteps towards the room. He will not go outside with me at night. During the daytime he's fine and comes to me for loving. He also is extremely grumpy when he sleeps at night if you have to move or touch him. Again during the day fine no problem.