The difference between dog harnesses is that they have one that is a back clip harness which is comfortable for the dog to wear but they have little control of the dog.Back Clip harnesses are more meant for smaller dogs instead of bigger dogs, the harness isn't made for dogs who tend to pull and or untrained.The Front clip harness is more made for dogs who are in the process of training and you have more control of the dog, but The front clip harness has a higher chance of getting tangled in the leash and with the dog's legs, also the front harness minimizes the pressure on the dog's neck and lowers the risk of choking.The back clip harness is more used on dogs who have been trained because they won’t pull away unlike the front clip harness is used more for training dogs.