So, I ran an areal dog run yesterday

The reliable lock button gives you capability to adjust the leash’s length when needed, allows the leash to stay at a constant length, to ensure you could absolute control the safety of your dogs and yourself.
Dog Training Leash, 20ft Dog Retractable Leash With 9 LED Detachable Flashlight Durable and Ergonomic Design With Comfortable Grip -Lock & Release button Works Every Time
Ergonomic TPE Anti-slip Handle is easy and safe to grip, provides enjoyable walking experience with your pets and you don’t worry about the dog leash will hurt your hand when the dog run about madly.

The handles of retractable leashes are bulky and can be easily pulled out of human hands, resulting in a runaway dog.

Ever wish you could leave the house and have everything you need to go for a walk right there on your dog's collar? The Release N Run Large Collar Retractable lead is an awesome collar with a built-in 4 foot leash that retracts into the collar immediately upon letting go. Made from Cordura and Spectra cord (used as climbing webbing), the strength of the Release N Run leash is rated to withstand dogs up to 110 lbs. Spectra, made by Honeywell® is one of the world's strongest and lightest fibers. Equipped with an internal retracting mechanism that was designed for salt water use, this lever has been manufactured for superior strength and durability. If you are looking for a premium leash/collar combo, look no further! The Release N Run Large Collar Retractable Lead is the collar for you!

Dog Tie Outs: Retractable Cable Tie Out at Drs. Foster and Smith

Retractable dog leashes (aka flexible leashes) are a great addition to a dog owner’s arsenal, particularly if the dog loves to run. Here is another kind of a retractable leash that is similar to the other kinds of a retractable dog leash. It is made for those who owns big dogs so that even if they are running it will still be able to support them. It is made for it to last because it also has a leash that can extend up to 16ft which is already long enough for your dog to run around while you are still on hold of them. It has a button where you can control the length of the leash so that even if you are just walking your dog, the extra leash will not bother and tangle your feet whenever you are walking your dog. It is also one of the best kinds of leashes if you want to have an organized place because there will be no tangling whenever you store it in the storage cabinet.

End the frustration of carrying your dog's leash

This kind of a retractable leash has a tape that can extend up to 16ft. It is already long enough for your dog to walk or run away from you but at the same time, you can still control the distance that they will run. It can support up to 110lbs. of dog weight so that even those who have big dogs will still be able to use this kind of a leash. It comes in color blue but there are still other colors of this kind of a leash for you to choose from. It also comes with a small plastic casing os that in case that your dog poops at a public place, you can always clean up their litter so that it will not bother the people who are passing by.

Double Dog Run: Strong, Portable, Tangle-Free Dog Tie Outs