Martingale collars are Behave’s “go to” training collar for a few reasons. One, they are almost impossible for a dog to wriggle out of when properly adjusted – even escape artists can’t get out of these! Two, they give a very gentle correction by putting pressure on the neck. Third, they are easy to fit – especially for growing puppies.
We prefer martingales that are all fabric, not chain, as they give a gentler correction, are more fluid, and for long haired dogs chain can pull out fur. This is the site that we use for our orders, but you can get a martingale collar at most major pet stores.