@brothersnook You’re welcome!
The main difference between the martingale and regular slip is the martingale has a stopper so it can only tighten so much. There are martingales that have the chain and ones that look like regular flat collars. If a dog is a strong puller, it can choke on either.
The thing about harnesses causing pulling is a myth (marketing strategy for aversive tools and methods). The force of the pull can be stronger on a harness, sure, but equipment alone won’t cause pulling. This is why if someone doesn’t use “well-timed corrections” a dog will pull on a prong or slip.
Leash corrections (pop, tap, bump, tug the leash; euphemisms for punishment) are usually recommended in conjunction with prongs or slips but not by this sub and most other dog related subs. They work on the basis that it’s very unpleasant-dog decreases pulling to avoid the correction. Leash corrections are less effective on harnesses (why harnesses are demonized by some trainers) but can still be unpleasant to the dog. My dog experienced behavioral fallout from corrections on a harness btw.
Something else to consider is function of pulling-to get to something or away? Is the dog just moving fast (humans are slow)? Is the behavior of pulling reinforced by the human moving forward with tension in the leash?
I get the equipment and training methods are confusing. Dog training has no regulation. No minimum education requirements, no licensure, and not all trainers have the dog’s health and safety in the forefront of the training plan.