It is very good to but not compulsory
It is called a choker collar( or a choker chain), because if your dog say for example, has seen a cat, and goes to chase it, you either pull on the lead or (if the dog is not strong enough to pull you) stand your ground, therefore choking the dog. The dog knows it must stop in order to bring an end to the choking.
There is no "choker" in hockey
Probably a dog. -Knowledge
Dog Choker
The choke collar/chain is a training tool and as with any tool there is the potential for misuse. A hammer used one way can help build a house. Used another way, it can destroy it.Do your research and you will discover that the choke chain is a time tested instrument that, used properly, results in a well trained dog without inflicting physical harm. It is often misunderstood and misused simply because of its name.Consult a qualified trainer for instruction on the proper fitting and use of this training tool. A German study showed that damage to the dog's trachea or Hood was very common if this type of collar wasn't used properly.IMPORTANT: DO NOT LEAVE YOUR COLLAR ON YOUR DOG ALL THE TIME. ONLY WHEN IT IS NEEDED.IMPORTANT: TAKE OFF COLLARS, LEASHES, ETC. WHEN PUTTING YOUR DOG IN A CRATEOther contributors have said:If you decide to use the choker collar then that's what the choker collar is meant for to teach your dog how to heel because if your dog pulls to much you gently pull. You don't pull hard otherwise your dog will get hurt. so it could be harmful if you pull too hard. while training my dog I used the choker collar. I didn't pull too hard and it worked and my dog did not get hurt. I prefer the choker collar better than any other collar to teach your dog how to heel. Also, if you feel your dog is not pulling anymore after your training, you can try a regular collar. If you feel it doesn't work and your dog is pulling again go back to the choker chain. It will NOT hurt the dog if you use it properly.For more information on collars you can visit the following link in the source related link.It could help you make a decision on what is best for your dog.The fact that you have posed the question implies that you are already doubtful about the use of a choke collar and therefore unfamiliar with the collar yourself. As another answer confirmed, a choke collar can harm a dog's trachea and potentially whole spinal area - they are very dangerous if not used correctly and it is easy for an untrained person to unwittingly inflict pain and damage on their dog using a choke collar. More humane methods of training a dog not to pull are widely available, with no risk of hurting your dog. A 10 step system of 'how to train your dog to walk nicely and stop pulling' is linked below - a simple, tried and tested method that works well with a good, inexpensive anti-pull harness. Dog training DVDs are a good source of you learning how to train your dog using natural methods with no expensive, potentially harmfull products such as choke chains and shock collars.
Keep your things in a place where the dog can not get them. This dog may need training.
A good book on dog training is a great start. After that it's a matter of time and patience. The more time you put into your dog training the better the results will be.
You should not have to pay for dog training classes. All you need is time and patience. there are plenty of websites, books, and people out there to give you advice for your problems. Cesar Milan is a very knowledgable guy about dog training. So, this will solve 2 problems, it will give you something to watch, like reality TV, and it will help you with your dog problems.
Dogs need to be trained before they can perform as a guide dog.
Training your dog shouldn't be a cruel or unpleasant experience. We don't need to shock, hit, pin, or so much as touch our dog in that sort of way. All you need to have set in your mind is "Dog, if you do this something good will happen," not "Dog, if you don't do this something bad will happen."
All dogs need to be potty trained... If you want a dog to do its business in the house... Go for it
its helps them become a perfeshinal dog