A dog collar is a piece of material put around the neck of a dog. A collar may be used for control, identification, fashion, or other purposes. Identification tags and medical information are often placed on dog collars. Collars are also useful for controlling a dog manually, as they provide a handle for grabbing. Collars are often used in conjunction with a leash, and a common alternative to a dog collar is a dog harness. Dog collars are the most common form of directing and teaching dogs.
Collars are made with a variety of materials, most commonly leather or nylon webbing. Less common materials can include polyester, hemp, metal, or "oilcloth" (vinyl woven with cotton). Collars can be decorated in a variety of ways with a variety of materials. The basic collars for everyday wear are:
Several types of collars are used for the purposes of training dogs, though sometimes a collar is not used at all (such as in the case of dog agility training, where a collar could get caught on equipment and strangle the dog). Each training collar has its own set of advantages and disadvantages (briefly outlined below) which trainers might consider before using a select one. Training collars are typically used for training only and not left on the dog's neck all the time, as some collars can be harmful or dangerous if left on a dog unsupervised.
Most dogs are trained on leash using a buckle or quick-release collar.
Martingale collars are recommended for Sighthounds because their heads are smaller than their necks and they can often slip out of standard collars. They can, however, be used for any breed of dog. Their no-slip feature has made them a safety standard at many kennels and animal shelters. A martingale collar has 2 loops; the smaller loop is the "control loop" that tightens the larger loop when pulled to prevent dogs from slipping out of the collar. A correctly adjusted martingale does not constrict the dog's neck when pulled taut according to some who use them. Others use them fitted snugly to be able to use them in a similar manner to a choke chain but without the unlimited constriction of a choke chain. The structure allows the collar to be loose and comfortable, but tightens if the dog attempts to back out of it.
Head halters, also called head collars, are similar in design to a halter for a horse. They are sold under several brand names, including include "Comfort Trainer",Halti, or Gentle Leader or Snoot Loop, that are also used when referring to these collars. This device fastens around the back of the neck and over the top of the muzzle, giving more control over a dog's direction and the intensity of pulling on a leash than collars that fit strictly around the neck. Pressure on this type of collar pulls the dog's head towards the handler. These type of collars can stop a strong dog pulling an owner in an unsafe direction. They are also good for dogs that pull as the pressure will no longer be directly on their wind pipe.