There are several methods for stopping a dog from barking, but the most effective will depend on the specific situation and the reason for the barking. Some possible methods include teaching the dog commands such as "quiet" or "enough" and rewarding them for obeying. If the dog is barking due to separation anxiety, for example, addressing the underlying issue through training and behavior modification can help. You can also try providing plenty of exercise, as a tired dog is less likely to bark excessively. In some cases, barking can be attention-seeking behavior. Ignoring the barking can help to reduce the likelihood that the dog will continue to bark. You can use anti-barking collars that emit a sound or a spray that distracts the dog and makes them stop barking. But please refrain from inhuman anti-barking collars that shock the dog. Some forms of barking may be due to medical conditions or other underlying issues, so it is always best to consult with a veterinarian or professional trainer to determine the best course of action.