However, I'm not sure I would recommend a martingale for a brachycephalic breed such as the CKCS.The breed already tends to have a higher predisposition to airway problems, pulling on a martingale may accentuate that.
A martingale can be used as a training collar, but it's really not (compared to a prong, pinch, or choke.)....//.....it's not really snug enough to be any kind of aversive...