[QUOTE=Yorkiedaze;3725386]The step in harnesses work best. MY Zada has a collapsed trachea too and she has several from Chattismom and the Buddy Belt.
Buddy Belts, Buddy Belt Harness - FunnyFur.com Step In Dog Harness, No Choke Dog Harness, Harnesses for Small Dogs
Exactly what i was gonna recommend, the step in harness.