Dog collars, dog leashes & dog harnesses Modifiable dog collars for flexible sizing we examined this collar on mac, an 18-month-old shih-poo (shih-tzu/poodle) who weighs 15 kilos. The collars vary from 1/2 to 1 inch extensive, depending on size, and all have reflective stitching for nighttime visibility. The neo canine collar can additionally be out...