12/01/2026
My dog, 8 years ago with a badly fitting harness.
Not all dog harnesses are good — even though they’re often marketed as the “kinder” option.
A dog’s front legs are not attached to the body by a collarbone like ours. They are suspended in muscle and connective tissue between the shoulder blades. This means the shoulders and upper legs must move freely for your dog to walk, trot, run and turn properly. When a harness sits across the shoulders, over the shoulder blades, or wraps too tightly around the chest, it can interfere with that natural movement.
Many popular harnesses restrict shoulder extension. Over time this can shorten stride length, change gait, and place extra strain on joints, muscles and the spine. Dogs may compensate in ways we don’t notice right away — but those small changes can add up to pain, stiffness or injury.
Pressure matters too. A poorly designed or badly fitted harness doesn’t just “spread the load” — it can concentrate pressure on sensitive areas like the sternum, shoulders, nerves and soft tissue. This can affect breathing, balance and comfort, especially in dogs that pull or are active.
Tightening harnesses are also problematic. These are designed to constrict when a dog pulls, which means every step forward increases pressure around the chest and shoulders. That creates a constant cycle of restriction and force on delicate structures, rather than teaching the dog how to move or walk better.
A good harness should:
• Allow full, free shoulder movement
• Avoid crossing the shoulder blades
• Sit clear of the throat and windpipe
• Distribute pressure across the body safely
• Never tighten or constrict when the dog moves
• Fit the dog’s shape, not just their size
Harnesses are tools — and like any tool, the wrong one used in the wrong way can do harm. What matters is biomechanics, fit, and freedom of movement. Show me a photo of your harness and I'll tell you if its a good fit.
