Quote Originally Posted by Velobambina View Post
You girls are BAD. LOL.

Why do dogs bark at the USP and FedEx trucks? My three do it, as well.
Because they are successful. Their aim is to scare off intruders...and lo and behold...they bark and the trucks leave. Same with the mailman...they have success everytime. So its self rewarding.

We will always repeat behaviors that contain rewards . Positive Reinforcement.