I already wrote about retractable dog leashes that are perfect for small to medium sized dogs. With large dog breeds you might though look for a strong rope leash that holds against strong pulling or even chewing.
There are some requirements that a dog rope leash should fulfill in order to be comfortable in your hand and to withstand your dog‘s strength.
At first glance a dog rope leash may display a simple design but it never should be made of simple materials. It‘s nothing more than a rope and a clip, but they should be made of the best quality possible.