Now with Brass Plated Buckle, Rivets, and Rings! A center "O" ring collar is a designed to roll and give a dog a better chance to escape if the collar were to become tangled in brush or fence. Latigo leather is commonly used to make horse bridles and reins because of its strength, durability and beauty. And, this collar has the added benefit of a dee-ring so you can attach your tags to the dee-ring and, because the o-ring stays on the back, you won't have to reach to the front of your fasten your leash.