As long as your dog is physically capable of walking then your dog is able to walk on a leash, without pulling. It doesn’t matter what breed, size, or age your dog is. You must not use punishment here, no leash corrections, or any aversive methods. This should be a pleasant experience for both you and your dog. Why teach your dog that pulling equals pain and an upset owner, when you could teach the dog that staying next to you on a loose leash is much much more rewarding.