If you purchased a size based on your pup's chest girth measurement and our sizing guide, all is not lost! There are often additional adjustments to make before considering a return. Our harnesses ship in their smallest configuration and must be adjusted to fit. The straps are tucked into the harness and can be pulled out to allow for maximum adjustment. We recommend adjusting the straps, observing the fit around the house, then making adjustments to fine-tune the fit before heading out for your next adventure. To get started, check out the short video below on how to fit our popular Front Range Harness in 2 simple steps. You can also check out this step by step guide for buckle adjustments How to Adjust the Front Range Harness Instructions)