Putting on a harness may seem like a daunting task, but it is actually quite simple. Just follow these easy steps: Place the harness on your pup’s back. Fasten the straps around your pup’s chest. Adjust the straps so that the harness fits snugly but not too tightly. Attach the leash to the harness. And that’s it! You’re now ready to take your pup for a walk.