Answer:
Pavlovian (or depending on your teacher, Classical) conditioning
Explanation:
What has occurred in this scenario is that your dog has associated the rattle of the leash to mean he is not going for a walk, and subsequently he does not come to the door for the simple purpose of he wont get anything out of it. This is because of the learning procedure in which a biologically potent stimulus is paired with a previously neutral stimulus. This is known as Pavlovian Conditioning,