Whether you call them shy, cautious or just plain scared, there are a lot of dogs struggling to deal with this issue, and just as many people trying to help their dogs deal with and overcome their fears. A great website called fearfuldogs.com  offers great information and lots of links to direct you to the help you need.
The site was started by a woman whose dog Sunny, pictured here, survived a hoarding situation before arriving at her loving home in 2005. It was developed to prevent others from struggling with the many frustrations of rehabilitating a fearful dog who was not blessed with the best start in life. Good information is your best tool for helping dogs who are afraid, and this site refers to only the best, most reputable and effective products and services that relate to helping our fearful canine pals.
Check it out and let us know what information and advice you found there has been most helpful to you and your dog!