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They're good for recall training. We used one for our dog. I guess the benefits over a retractable lead are that the dog doesn't feel like it's on a lead so gives you a better idea of how they'd behave off lead and a retractable lead is quite hard to spot sometimes, if your dog is miles away from you, a thick, brightly coloured bit of webbing is much easier for pedestrians/cyclists etc to see than a thin black cord.
Is there a trend of dog owners using very long, non-retracting leads? Like 5-8m webbing leads. If so, why not use retractable leads?