A "special harness" refers to a specific kind of equipment or contraption designed to securely hold or support something or someone, providing them with extra protection or assistance. Full definition
It features Graco's special harness system that lets you adjust both the headrest and the harness to eight different positions with no need to rethread the straps. (thespruce.com)
A normal day for us is putting on Grace's special harness which is thicker under the tummy than a normal one and heading out for our morning break. (lessonsfromaparalyzeddog.com)
With the above in mind, it appears that no pull dog products such as special harnesses or collars are indeed the best solution we have today. (topdogtips.com)