Best Reversible Breathable Neoprene Dog Vest Harness by (PRINTZ) Soft No Choke Design | For Small To Medium Sized Dogs | Frenchie | Pug | Schnauzer | Boston Terrier Reversible Harness by Printz Pet Supply No-Choke Design that eliminates pulling on the neck Dual-Reflective Safety Label Neck- Measure the circumference where your dog's collar would naturally sit. Chest- Measure the circumference around the widest part of your dog's ribcage just behind the front legs.