Here we are discussing types of collers, leashes and harnesses that are used commonly for dogs.

Types of Dog Collars

Dog Coller

Dog collars are not so simple as they seem. There are many different types of dog collars available in the market to suit different functions and needs. Different kinds of dogs need to be harnessed using different dog collars. The independent and intelligent dog breeds such as Boxers need firm and fair training to be obedient and learn good manners. These dogs can be friendly and quite useful once trained properly but do not like to be ordered around. To choose a right collar, you must read this article that details the uses of different types of collars:
Buckle collars have are meant to be buckled to fasten them and are mostly made up of nylon, cotton, or leather. They can both be flat or rolled and are quite adjustable. Buckle collars are adjustable and do not strangle dogs. Rolled leather collars are better than flat ones as they avoid chafing or hair breakage.
Flat nylon buckle collars have plastic fastenings that help to put on and take off the collar quickly. These are adjustable too and do not tighten around dog's necks.
It is a quick-release collar and is meant to help the dog pull itself free, if the need be. Its inventor was inspired to design it after his dog get choked to death because the collar he was wearing got caught on something. However, if attached to a leash, the collar will not open, giving you the freedom to control the dog, when you are with him.
Slip collars are also known as choke chains or chokers. They can be made of braided nylon, cotton, metal or leather and have 'O' rings at either end. The collar is looped through one of the rings. The collar can be tightened and loosened with pressure from the lead. Attaching the lead to the floating ring or the dead ring will prevent the collar from tightening.
The metal training slip collars known as choke chains are still in use as the primary training tools for the dog. They are used to give dogs a jerk, if they do not obey a command but are not advisable as they may cause neck, back and tracheal injuries to dogs and may also cause them trauma. Only qualified, experienced instructors may use them with care. Width and weight of the links decide the type of chokers to be chosen for the dog. Heavy chains need collars with rough sliding. They are the training collars and must never be used on puppies. Tags should not be attached to chokers. Long-haired dogs need wide-link chokers.
These training collars are much safer than the chokers and do not cause neck, back or tracheal injuries. However, since they are may get worn and stretched and thus spring open, they can only be used with a back-up collar hooked to the leash. Not intended for puppies, they should only be used carefully.
Head halters are much like halters used for horses and are meant for dogs that pull. They sit right below the dog's eyes and thus are uncomfortable to most dogs. They should not be confused for muzzles as they allow the dog to drink, eat, bark or bite. It is to be used when the dog is walking at your side and not trying to escape from you.
Harnesses are used for sled and carting dogs to help them pull and is the most effective means to distribute weight evenly. It enables the dog to pull many times its own body weight
'Remote' collars or 'shock' collars deliver an electrical stimulus to the dog in training as a 'correction method'. The intensity of the stimulus starts from low level to high, depending on the disobedience of the dog. These training-only collars should only be used by professionals or may have destructive effect on dog's self confidence, desire to work and general good will.

Collars should fit well and especially the non-slip collars should be loose enough to leave two-finger width space between the collar and the neck of the dog. Improperly fitted collars and their incorrect usage may even prove fatal to dogs.