In this report, we introduce a new type of acrylic tracheal prosthesis for treating tracheal collapse in dogs. As exterior tracheal prostheses, polypropylene products such as syringe cases are generally used although they are not always successful. In Japan, an acrylic spiral line prosthesis (FLLP), which is made of the same material as optical fibers, is popular because of its flexibility, but FLLP is problematic in surgical operations. We devised another kind of acrylic wiry prosthesis folded in a zigzag manner into the shape of a cylinder, the Parallel Loop Line Prosthesis (PLLP). To test its usefulness, surgical corrections using a PLLP were performed in five small dogs aged four to eight years with tracheal collapse. The outcome of the operations was favorable, and we confirmed the superior operability of the prosthesis, ane its ideal mechanical properties in suturing and fixation.