Dog harnesses have several benefits over traditional collars and many owners who have made the change have not looked back! For dogs that pull, a harness spreads the load around the body and reduces strain on the neck and back, this is especially beneficial for small breeds and puppies. In some cases, collars can also restrict a dogs breathing, you may have heard this when walking if your dog pulls very hard. Dog harnesses are also more secure and give you more control when walking and training.