A dog harness shouldn’t restrict movement, rub armpits, or become an escape tool — it should feel secure, comfortable, and effortless. In this Boston Made Pets guide, we break down the exact harness fit tests you can do at home to tell if your dog’s harness is too tight or too loose. Learn how to adjust straps properly, avoid common fit mistakes, and make every walk safer, smoother, and more comfortable for your pup.