To put on a dog harness, start by sliding the harness over your dog's head, making sure the Ruffwear logo is facing the right way up. Then, fasten the buckles on each side of your dog's body, ensuring a secure fit without being too tight. Adjust the straps for a snug fit by tightening or loosening them as needed, making sure you can fit two fingers between the harness and your dog's body. Once the harness is properly secured, attach the leash to the harness's designated attachment point and you're ready to go.