A dog may be man's best friend, but continuous excessive barking can certainly test that friendship. In fact, many towns have disturbance laws against loud, prolonged noise, such as that created by barking dogs.
Many owners have tried surgical remedies. Not only is this expensive, but it completely and permanently eliminates a dog's natural ability to bark. Spray Control Anti-Bark Collars are an inexpensive, humane, but effective solution to excessive barking.