Why is it bad for your dog to pull on the lead?

As well as having health issues for your dog (neck injuriesfor instance) lead pulling can impact the relationship between you and your dog.

It can make walks stressful instead of joyful for both you and your dog. When you’re walking your dog
you may feel frustrated and anxious trying to control them. Your dog can pick up on your anxiety and this may increase their own stress levels. If you have a large dog there is the possibility they could pull you over causing you injury. Or they could pull the lead from your hand and escape getting lost or injured themselves.

How to stop dog's pulling on the lead.