A poorly fitting collar or harness can be uncomfortable and even dangerous for your dog. Signs that indicate the collar or harness doesn't fit properly include: 1. Chafing or irritation on the skin under the collar or harness. 2. Difficulty breathing or coughing when on a walk. 3. The collar is too loose and slips over the head easily. 4. The harness is too tight and restricts movement. 5. Your dog tries to remove or chew on the collar or harness frequently. To ensure a proper fit, you should be able to fit two fingers comfortably between the collar or harness and your dog's neck or body. Always check the fit regularly, especially as your dog grows or gains/loses weight.

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Topics covered in this question:

Dog Health Dog Care Dog Harness Dog Collar