I found this article on the web which spoke of some reasons and some actions to counter it.
Reasons for the Barking:
Whining, barking and howling reflect a dog's emotional state. For example, a dog that is excited or startled may bark to express its agitation. It is important to bear in mind that your reaction to your dog's barking or whining will directly determine its behavior in the future.
Barking to attract attention--Your dog can learn how to behave in ways that attract attention if you reward its behavior with attention. If your dog barks when it sees food and you then give it food, the dog will learn to bark for food. The dog may then learn to bark in a variety of situations, many of them inappropriate, for a reward. The reward may take many forms, including food, praise or petting. Even in the form of punishment, negative attention is still attention. Sometimes the best way to deal with attention seeking barking or whining is to simply ignore it. As difficult as this may be, keep in mind that you encourage barking by giving your dog any attention, positive (reward) or negative (punishment).
Barking during isolation--A dog that is not accustomed to being alone may become anxious when isolated or separated from a playmate or human companion. This anxiety may be expressed by whining, barking and howling. The dog may bark or whine only in the first moments following separation, or may continue the entire period of isolation. Behavior modification, sometimes combined with sedation as necessary, may be the viable solution. Vocalization (barking) may precede other forms of separation anxiety, such as destructiveness, inappropriate elimination and excessive grooming.
some more details/tips
-Raapi
Posted by rajesh | 
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