how to choose a correct size Please measure your dog's neck girth with a soft measuring tape Add 2 inches for initial collar length for adjustment Leash attachment: O-ring attachment, easy on and put off. How to make two rings together To use the collar you need to slide the chain through one of the loops to make it into an actual collar. Then figure out what side your dog normally walks on. Now, this is important, FACE YOUR DOG. Have them sit in front of you, and if, when walking, they walk on your right, shape the collar in “q” and slide it over their head. If they walk on your left, shape it in a “p” and slide it over their head. It should slide over their head easily, but not be super loose. It should be like how it feels when you put on a new T-shirt. Snug, but not tight. When it slides past their head it should have about two inches, maybe more, again depending on the breed, of slack. Safe and effective way to train your dogs with our chain collar , Designed to tighten under tension, correct the wrong behavior by pulling the leash with a gentle but effective feedback. Safe effective dog training tools with proper use, These training collar provide a heavy-duty safe alternative to standard choke chains.