Tasman's Natural Pet Bridle Tanned Bison & Elk Leather Dog Collar (1" x 20", Walnut/Gold) MEASURE GUIDE: Measure your dog's Neck Loosly. This will be the size you need. Made from Genuine American Bison Leather 12" Collar - 5/8" Wide. 14,16" Collar - 3/4" Wide. 18-24" Collar - 1" wide Bridle Bison Leather tanned using vegetable extracts Lined with soft Elk leather - Adjusts +/- 2in. from listed size