The type of collar or harness used on a dog affects their physical welfare, particularly in dogs who pull on lead or who have respiratory vulnerabilities.
Collar and harness choice directly affects physical welfare for dogs who pull on lead — a significant proportion of the companion dog population. Traditional flat collars used with pulling dogs create repeated tracheal compression and potential cervical spine stress; over time this causes injury that owners often attribute to other causes. Aversive training tools — choke chains and prong collars — function by causing pain and discomfort; they suppress pulling through aversion rather than teaching alternative behaviour, and their use is associated with increased fear and aggression. Front-clip harnesses and head halters provide management alternatives that redirect rather than punish, protecting physical welfare while enabling effective on-lead communication.