5 Signs Your Dog's Harness Doesn't Fit Properly. Every great walk starts with the right fit. A harness that's too loose can let your dog slip out, and one that's too tight can rub and restrict movement. Here are 5 simple signs to check. 1. Your dog can back out of the harness. So it is too loose. You should be able to fit about 2 fingers between the harness and your dog's body. 2. You notice red marks or missing fur after walks. 3. Your dog suddenly resists wearing it. That can mean discomfort. 4. The harness slides around while walking. It should stay put. 5. Your dog can't move comfortably. They should walk, run, sit, and play naturally. If something seems off, adjust or consider a different size. A minute checking makes every walk better. At Winston Ridge, we believe every adventure starts with comfort and safety. Winston is always happy to test comfy gear before we recommend it to fellow dog lovers. Thanks for stopping by our blog, and we hope you'll check back often for more dog care tips, product recommendations, and fun adventures with Winston.