It is extremely difficult, but not impossible, to wean a dog from pulling on a leash during a walk.
We'll tell you what you need to do for this.
How to Train a Dog Not to Pull on a Leash
First, replace the retractable leash with a regular leash about three meters long.
Secondly, at the slightest tension on the leash, stop immediately so that the dog understands that its behavior does not lead to movement, but to a stop.
If the dog continues to pull on the leash, do not give in, if it starts to chew on the leash, distract it.
Whenever the leash slackens, even accidentally, actively praise the dog with your voice; as soon as the leash tightens, shut up.
You can also reinforce your pet's correct behavior with a treat.
You need to understand that you won't be able to wean your dog off pulling on the leash in one day. Be patient, and you and your pet will succeed.
