Earthdog Decorative Hemp Collar, Star Pattern (Blue, Medium) Great for your dog and the earth: Earthdog collars are made triple layer, 100% hemp canvas which is hypoallergenic, resists odors and is earth-friendly. Easy on and off with quick-release clip: Adjustable too, of course! Handmade in the USA by Earthdog, a wonderful, rescue-focused small business that we are very excited to support. Easy Care: Earthdog hemp dog collars can be machine washed and dried. They get softer with each washing! Sizing: Measure around your dogs neck with a soft tape measure and add an inch or about the thickness of two fingers for wiggle room. Small: 8"-14", 1" wide. Medium: 14"-20", 1" wide. Large: 18"-26", 1" wide.