There can be many reasons why your dog would bark almost constantly. Although this may be frustrating, there can be some good reasons for the barking. Your Dog could be trying to warn you of a threat or let you know it is in pain.
There are other not so great reasons why you dog would be exhibiting this behavior. They could be trying to get attention or be deliberately acting out.
Whatever the reason, a dog that won't stop barking can definitely give you a headache. If the problem is recurring there are some techniques that you can try.
Most often, you can get your dog to stop barking by using a method of training. There are some specific methods and devices to help with the problem of a barking dog.
Many cases of incessant barking can be controlled by using training and a reward and reprimand system where you teach the dog when to bark and when not to. When the dog barks at an inappropriate time, they are scolded and told "no barking". When they get it right and refrain from barking when they shouldn't be, reward them to reinforce this positive behavior.
If the problem can not be controlled this way, you can elect to consider the purchase of a bark collar. A bark collar will deliver a small electric shock when it detects the dog barking. The shock provides only minor discomfort and does not actually hurt the dog. It should be noted that some owners don't like this method as a matter of choice.
There is also a similar device on the market that instead of a shock delivers a mist of citronella. Dogs hate the smell and they soon realize it is related to their barking.
In some rare and extreme cases, your vet may consider your dog a candidate a type of debarking surgery. This procedure involves the removal of a fold of tissue from the dog's larynx which makes the dog unable to bark. This procedure is not always effective and is not widely used.
While a barking dog can certainly drive you up the wall, as you can see it's not a problem that can't be fixed. With the right amount of patience and training, you can put an end to your dog's unfortunate habit.