Short answer: for many dogs, a well-fitted harness is a comfortable, safe choice, and a flat collar is for ID and a backup. Neither teaches your dog to walk without pulling. That is training.
Dogs Trust says harnesses can reduce the risk of neck injury and make walks more comfortable, but you still need to teach your dog to walk nicely on the leash. Choose carefully: some harnesses cross directly in front of the shoulders and restrict natural movement, so avoid those. Battersea calls a flat collar a simple, safe choice for most dogs. For more on this, see How do I teach my puppy to wear a harness without a struggle.
You should be able to fit a finger between the harness strap and your dog's body, so it does not shift when your dog moves. Your dog should not be able to slip out. A flat collar should fit snugly, with two fingers between collar and neck, according to Battersea. Check the gear regularly for wear and tear.
Put the harness on the floor, scatter treats around it, and let your dog explore. Feed treats through the head opening while holding it up. Add each step slowly and reward as you go. Dogs who dislike having things over their head may do better with a harness that clips around the neck and body.
Equipment manages. Training changes. Teach your dog that a slack leash moves the walk forward. A harness can make pulling less painful for the neck, but it will not remove the habit.
If your dog is scared of the harness, freezes, or tries to get away when you handle them, ask a qualified reward-based trainer and have your vet check for pain.
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