This post may contain affiliate links. Please see our disclosure page for more information.
The only benefit is to the person walking the dog, there is no benefit to the dog. In fact, it is dangerous. There are dozens of reasons why you should never ever use retractable leashes. You can google many articles on the reasons why. Here I will focus on the leash I recommend.
I really like leashes that have 2 handles, like this one. It is 6 feet long and is great for safety training with a second handle at 1 foot from the clip. This is one of my recommended items to include in your Senior Dog Care Kit.