D-End Dog Collar – Waterproof BioThane® – Designed for Pulling DogsMade specifically for your dog each collar is crafted in house to your dogs exact measurements, giving a true custom fit rather than a best guess from standard size ranges. Designed for medium to large dogs that pull this reinforced D end design positions the dee ring in front of the buckle so tension is placed through the doubled buckle section for added strength and stability. For this reason, this style is only available in 3 4" and 1" widths.