Release the buckle and lay it on the floor

Step your pet’s front legs through each side

Pull harness up and wrap around chest

Secure the hook & loop fastener and buckle it

Use the 4 adjustment points on the straps to fit the harness snug on your dog. No matter measure or wear, Please ensure you can put1 finger between the harness(or ruler) and your pet, which can make the harness snug on your pets while they feel comfy