A vest-style harness for a dog is better than a collar for attaching a leash because it’s nowhere near as likely to cause harm to a dog’s neck. It also makes it much easier to control a dog because the chest attachment point enables you to turn the dog’s body instead of just its head. Also, a vest harness spans more of a dog’s body than a standard harness, spreading out pressure and making it more comfortable. Vest harnesses also offer several other features, depending on the type. But you need to be comfortable using the vest harness, too.