In most cases where you’re walking the dog, a harness will be a better option. Harnesses generally offer more control, security, and comfort for the dog, but collars can be a great option for short outings or even training. In many cases, it’s recommended to have a collar on your dog even if you are attaching your leash to their harness for identification purposes in the event that they get lost. Most EzyDog harnesses include an ID tag attachment point so you can get the best of both.