Evidence-based comparison of harnesses versus collars for dogs, including welfare impacts on the neck, trachea, and behavior.
The choice of walking equipment has measurable welfare consequences for dogs. Flat buckle collars on pulling dogs create concentrated pressure on the trachea, thyroid gland, and cervical vertebrae that can cause injury ranging from subclinical damage to acute trauma. Studies have found elevated intraocular pressure in dogs walked on neck collars — relevant for individuals with glaucoma risk. Harnesses that distribute pressure across the chest eliminate these specific risks while providing equivalent control. Front-clip harnesses additionally reduce pulling through body mechanics rather than aversion. Prong and choke collars solve the problem by causing pain — a welfare trade-off that evidence does not justify when effective alternatives exist.