Certain dog breeds are better suited for harnesses, particularly those prone to respiratory issues or neck injuries, such as pugs and bulldogs. These breeds benefit from the reduced pressure on their throat and airways that a harness provides. Conversely, breeds that do not typically pull on the leash, such as older dogs or those already trained to walk calmly, might be more comfortable with collars. Collars offer ease of use and are suitable for dogs that maintain a steady pace during walks, reducing the risk of neck strain.