Hi ~ I have two boxers. Both came from rescue, both have been through obedience classes and are very well behaved overall. My biggest issues with my boys is that one will 'hear' a noise (it's usually nothing) and tear across the room barking. This gets the other one going, and soon they are both standing next to each other either on the stairs or on the landing right near the stairs. We have a split leve home ~ where they stand is where they can see out of the small window we have along the door. When we had the new door installed in the entryway, we choose a window that only went halfway up the door ~ we used to have a small width, full length window on both sides of the door. As this was a problem even at that time, we decided to eliminate one entire window and only put half a window on the side we did keep (otherwise the hallway area would be pretty dark). So the problem is this: the dogs run to the door, barking and growling (again, usually at nothing) and then the younger of the two (they are about 4 and 6 years old) will get snippy and sometimes even downright aggressive with my older male. How do I prevent this from happening?? I have tried using *time-out*, placing the dogs in their crates when they do this, but I know that this is not the answer. I try recall, but this doesn't work. Both dogs will come to me easily any other time. I'm just at a loss. Thank you for any suggestions...