It’s relatively easy to teach dogs to be polite at the door. One of the reasons why I suspect that doorways have some special significance to dogs is that they seem to catch on quickly how to behave at the door, while exercises like heeling take months of work. (There’s nothing relevant to a dog about heeling. My own translation of heel from a canine perspective is: “Walk slowly at the pace of death by your owner’s knee while ignoring all interesting things.”) You don’t need to use food or toys for this training, because access to the great outdoors is its own reward. If Fido behaves politely,
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