Teaching your dog to speak on command can help you regulate his uncontrolled barking. Once he understands the concept of "speak", "no speak" will be more easily understood. For the dog that continues to bark after being commanded to stop, grasp his muzzle lightly and repeat, "no speak". If he continues, chuck him under the chin and repeat "no speak". If he continues, fill a spray bottle with water and give him a squirt in the face along with the verbal command. Some dogs learn to curb their barking the minute you reach for the spray bottle. A popcan filled with beans or coins and taped shut can be tossed at his feet along with the command. The noise startles the dog and interrupts his barking behavior, praise him for his silence. Stopping the behavior is only half the battle, TELL the dog when he is right!
If your dog is kept tied out all day with nothing to occupy his mind, he may be barking from boredom and frustration. Dogs are social animals, they prefer to interact with the other members of their pack (your family). Try to come up with a different solution for restrainng your dog when you are away from home so that he does not become a barking nuisance to the neighborhood. Allowing him to run loose is NOT a solution. Crate your dog indoors if the period of time that you are gone is not too long for your dog's bladder. Another option is to hire a neighborhood teen to exercise your dog for you in your absence. My circumstances (working twelve hour shifts) required another solution other than crating during my absence. My dogs have access to the kitchen and bathroom with a dog door leading to a large fenced yard. They can come and go freely, an ideal solution.