Though there are several “no-pull” options on the market, PetSafe's Easy Walk Harness is the fool proof one that will discourage even the hardest puller. Because the leash attaches to the front of the dog's chest rather than between the shoulders you will have an easier time redirecting and steering even a powerful or reactive pooch. When your dog pulls against the leash he will immediately turn towards you due to the front attachment which will encourage his attention to be on you. Though this harness comes in all sizes, it is designed and the most appropriate for a medium to large sized dog.
The first option isn't officially a harness, but it was invented to deal with many of the same behavioral issues that a harness is supposed to curb. PetSafe's Gentle Leader Headcollar looks a bit like a muzzle, but that's not its function. The Gentle Leader places pressure on the back of the neck rather than the throat helping to prevent choking. The design encourages your dogs head to move in the desired direction which will help a reactive or poorly leash trained pooch learn to walk more appropriately. Because this particular design can be tough for some dogs to get used to, start with a young pup to encourage good behavior when training.
The step-in harness is growing in popularity due to ease of use and sturdy design. What step-in means is that you place the harness on the ground, have your dog “step-in” and clasp at the top of his shoulders. Lupine is a great company due mostly to their quality products and their unheard of guarantee. They will replace any of their products, no question asked if it frays, gets chewed on or is otherwise destroyed. The Lupine step-in comes in a variety of colors and styles ensuring that both you and your dog will be happy with the purchase.
When you are the thrifty type and want to find a harness that will grow with your pup, the Coastal Pet Products Size Right Harness is a great option. The completely adjustable fit will ensure that it fits your dog properly and can be adjusted to accommodate weight gain/loss or growth. The comfort fit pad where you adjust the size is equipped with a swivel ring so that the lead won't get caught in the design. Available in many colors and widths there is a harness that will be perfect for your dog.