A wider contact area changes the setup It does not make the outcome automatic
A collar applies leash tension around a relatively narrow area. A harness can spread contact across a wider part of the body, although the actual result depends on construction, adjustment, connection point and movement.
This is a general mechanical explanation, not veterinary advice or a claim that one setup is right for every dog.
- Variables that change the result
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Front or back leash connection
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Harness shape and adjustment
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Dog size, proportions and movement
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Leash tension and handler timing
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Training history and surroundings




