One of the disadvantages of such dog leash for the dog harness that it's hard to hold on to the thin edge of the leash. If the dog jerks at this moment, you can even get the skin burn.
One can improve the flexi retractable leash. Attach a small hook to the end of the leash. Then fasten long dog leash. What do we get after that? Use the improved leash like a traditional dog leash - hold the leash in your right hand and check its length with the left hand (your dog should always be on your left). The flexi leash is wound and it is in "Stop" state. Being in the place of walking, you can remove the stop position. Then you give the dog the command "Free" and let it go. Such construction is good for dog walking harness, but it cannot replace a long leash for training harness.
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