Teaching ‘stop’ starts with interrupting the barking streak. There are a variety of methods for this depending on how strong willed the dog. For most puppies during their initial training your voice often will be enough. The next step up is spray from a water bottle, or a noisemaker such as a tin can with coins in it. If your dog has advanced to a top-level barker, a bark collar either that sprays citronella or gives off a static shock may be helpful. However, collars alone will usually not provide enough correction to eliminate barking, but are useful training devices. Once the barking is interrupted immediately praise your dog for his silence, and continue to reward him at intervals for being calm and quiet. If barking starts again immediately interrupt. Yelling or scolding your dog for barking often is counter-productive as it may be adding to the fear or excitement that has started the barking in the first place. A reward for good behavior is usually a much stronger incentive. Being consistent is one of the keys in any training, but especially with barking. Don’t expect that your dog can quit barking altogether. Also, deal with issues that may be adding to a barking problem. Often barking problems can be resolved once a dog knows what you want and expect.