In my experience, these types of leashes a.) tend to cause
dogs to act more aggressively and to pull hard on the leash; b.) are more likely to trigger a fight with another
dog since the
dog that is straining at the end of the leash looks like it is in attack mode; c.) tend to be purchased by lazy and
irresponsible dog owners who do not train their
dogs to obey, and who tend to spoil their
dogs, causing more aggression and bratty behavior; d.) undo most of the important aspects of your obedience training and leadership over your
dog, especially obeying around distractions and coming when called, and over time they teach your
dog to charge after other
dogs, animals and even people; e.) are hard to control once the
dog is at the end of the line, and can get caught in the leashes of other
dogs, increasing the potential for a biting or attack incident; f.) do NOT cause the
dog to get more exercise on the walk; g.) can cause a
dog to run away from you, because if you accidentally drop the leash handle, many
dogs will run from the plastic handle «chasing» them from behind and that could cause your
dog to run into traffic and die; h.) have resulted in injuries to
dogs and
owners.