Prong collars (also called 'pinch collars') are a series of chain links with blunted open ends turned towards the dog's neck. The design of the prong collar is such that it has a limited circumference unlike slip collars which do not have a limit on how far they can constrict on a dog's neck. The limited traction of the martingale chain combined with the angle of the prongs prevents the prongs moving close enough to pinch. The collar is designed to prevent the dog from pulling by applying pressure at each point against the dog's neck.
AKC Canine Good Citizen (CGC) evaluators are another class of dog-training professionals. AKC CGC Evaluators may or may not be trainers or behaviorists, but are certified by the AKC to evaluate dogs in the Canine Good Citizen test. Training other behaviors and getting a dog used to being alone, for example, can help reduce separation anxiety. The root cause, however, would likely need to be determined by a behaviorist, who could then refer you to a trainer if he or she was not able to help with the training issues.
Electronic collars (also known as E-collars) transmit a remote signal from a control device the handler operates to the collar. An electrical impulse is transmitted by the handler remotely, at varying degrees of intensity, from varying distances depending on range frequency. It is also done automatically in the bark electronic collar to stop excessive barking, and invisible fence collar when the dog strays outside its boundary. Electronic collars are widely used in some areas of the world and by some dog obedience professionals. This technique remains a source of controversy with many dog training associations, veterinary associations and kennel clubs.[6]
The clicker is a small hand-held device that makes a distinct, short sound to mark a desired behavior. (See clicker training for a more detailed discussion of this methodology.) It has gained popularity in recent years as being a means of training that does not involve physically correcting the dog, though it may be used in conjunction with these methods.

Clicker training, a common form of positive reinforcement, is a simple and effective dog training method. Although it is still fine to train your dog without clicker training, many people find it helpful. With clicker training, you can easily and effectively teach your dog all kinds of basic and advanced commands and tricks. It's fast and easy to learn how to clicker train your dog