Treadmill should never replace the walk but is great in addition to the walk. If your dog tends to pull, consider using the treadmill as a way to drain excess energy before the walk.

Some dogs who pull know exactly what the owner wants but can't help themselves because pent up energy inside if them is telling them to go faster.

Remember, dogs don't want to hold on to negative energy unlike humans. They attempt to find ways to release it.

Instead of getting into a battle of pulling, which associates you with resistance, allow your high energy dog to drain energy 1st with a treadmill, bike ride, rollerblade, etc.

Then proceed on the walk. Now you are creating a calmer walk that allows you to nurture your dog walking calmly and reward that state of mind as well as the physical position of being next to or behind you on a loose leash.