Start with a boring doorway
Use an interior door where a mistake is harmless. Approach on a loose leash and stop before the threshold. Reward any pause. Touch the handle, open the door slightly, and close it again if the dog moves through.
The dog does not have to sit. Standing calmly is useful for old dogs, large dogs, and dogs who find repeated sitting uncomfortable. The important behavior is waiting behind the boundary.
Add a release cue
When the door can open fully, say one release word and walk through together. Reward on the other side. Avoid using the release word while physically holding the dog back; the word should predict permission to move.
Practice with different household doors before using the front entrance. Keep the dog leashed at exits that open to an unsecured area.
Teach the curb separately
Find a quiet sidewalk or empty parking area with no moving traffic. Stop well back from the edge, reward the pause, look both ways, then give the release and cross. Repeat only a few times.
A trained pause is an extra safety layer, not permission to look at your phone or drop the leash. The handler remains responsible for checking traffic and choosing the crossing.
Generalize without testing danger
Practice at driveways, building exits, and quiet corners. Change only one difficulty at a time. A busier place, another dog, rain, and darkness all make the behavior harder.
If you need a rapid exit from an unexpected hazard, use the emergency U turn. Do not drill curb manners beside active traffic.
Solve rushing without punishment
Move practice to an easier door and use higher value food. Scatter treats inside the home while you clip the leash, then approach the exit only when the dog can think. Slamming a door, jerking the leash, or blocking with your body can add conflict.
A dog who suddenly hesitates at stairs, curbs, or thresholds may be uncomfortable or visually uncertain. Contact your veterinarian when the change is new, persistent, or paired with altered movement.
Set a rule the dog can recognize
Use the same stopping point and release word during early practice. At a door, that may be the edge of a mat; at a curb, it may be one paving seam back from the road. A visible, repeatable boundary is easier to learn than a handler who sometimes stops and sometimes keeps walking.
Do not depend on the dog to generalize automatically. A lift door, garden gate, car door, and road edge look different. Treat each as a new location, begin with easy repetitions, and retain physical control even after the pause becomes reliable.
Doorways and curbs are only two of the places a leash goes tight. The full picture of teaching a dog not to pull on the leash covers the rest of the walk.