The Martingale dog collar (sometimes called the Greyhound dog collar or Whippet collar) were initially created for the Sighthound dog breed. The heads of these dogs are smaller than their neck, and so they may easily get out of a more typical collar.
These kinds of collars have since then become more common among other dog breed owners, many preffering them over choke chains or buckle collars as they are both efficient and safe.
So how do Martingale dog collars work? These types of dog collars contain 2 loops which sit comfortably around the dog’s neck, and only tighten up if your dog pulls on the lead. As there are no buckles or rings involved, these kinds of collars will not catch on the puppie’s coat or scratch them and therefore are very safe.
Since Martingale collars don’t have to fit perfectly around your dog’s neck, it is possible to make a choice from a larger array of sizes. The truth is, a bigger measurement could be more desirable as it can both sit more comfortably on your puppy’s neck, and in the case that he is still a puppy dog then he can grow into it.