Chains, or choke chains, are slip leads that should only be used on dogs during times of training - not as an everyday collar.
A slip lead is a simple leash that loops through itself (like a choke collar or slip collar). It creates a 2-in-1 leash/collar system but you can also just leave your dog’s normal collar on.
I will never walk a dog on a flat collar. It is a recipe for disaster. Something about a leash on a flat collar just makes dogs want to pull. In many cases, the flat collar has to be so tight to prevent the dog from slipping out that the dog can’t tell the difference between the tightness of the collar, if they’re pulling, or a correction. They will feel like they’re being constantly corrected. A slip lead or a choke collar are only correctional when its needed. The tightness is purely reaction. In my experience, some dogs do better on a chain, even if it is a really thin one because of the noise it makes when it begins to tighten. It acts as a reminder before they begin to pull. It is pretty common to show Labradors on thin pretty slip leads at conformation shows in the US. It can be loosened and draped across the shoulders instead of the neck when they are standing still. It not only makes for a pretty picture, but it is also a gentle reminder for a well behaved dog. I love slip leads. They’re always in the car and the designated grungy one is for the beach/pond. I think they take a certain amount of practice on the person’s part though. The slip leads with the sliding grip to set how loose the collar part can become is good for people who are new to using them and for dogs that might not be completely trustworthy.
Link Sizes on Chrome Chain Dog Leads and Choke Chains | eBay
Pet Dog Slip/Choke Lead Leash Extra Long Soft Cushion Web 19mm
A martingale show lead consists of two parts: a fabric or plastic collar and the lead itself. The martingale collar is typically a single strip of fabric, both ends of which has a metal or plastic ring sewn into it. The lead consists of the handle loop at one end and a second loop at the opposite end that feeds through both rings on the collar and is sewn to the length of the lead. This permanent and unmovable loop controls the tension of the collar on the dog's neck, creating a limited choke that never becomes tight enough to actually choke the dog. The collar is prevented from opening widely enough for the dog to back out of the loop by a plastic or rubber slide that secures it in place.Interesting concept BUT any sort of lead or collar used up behind the ears, whether a cloth or leather collar or a Resco is doing exactly the same as a choke chain no matter how light the handlers’ touch. If my dogs are having a negative experience when being walked with choker chains why do they rush to get them on ? My biggest hate are the so called “gentle leaders” so often seen on “much loved pets” nothing is more cruel than those.The head halter is a very humane method of restraint because it doesn't cause any pain. It works much better to stop a dog from pulling than a choke chain or prong collar. Some brand names of head halters include "Gentle Leader," "Promise Collar" and "Halti." I was once tasked with the retraining of a show collie that had been lead broken by someone who used coercive training techniques. This lovely bitch would run and hide when I picked up a collar and lead. If I put a chain choker on her, she would keep one ear turned backwards, listening for the telltale “clink” of the links moving through the ring, which warned her that pain was about to occur. I switched to a nylon choker, which was only marginally better. She still would be fearful of the sound of the two rings clinking together. I eventually used a Resco noose, which made no clinking sounds. I would then take her on long walks with a calm and stable male I had. It took months, but I eventually convinced this dog that being on a lead meant only good things. I showed her at a match show, where her tail never quit wagging, and her overall type and beauty and lovely flowing movement won her the group.