Is there a genetic component to separation anxiety?

Nicole Wilde has an interesting blog post on this topic.  As she points out, there are many different causes that can contribute to separation anxiety, but I think there's something to the idea that separation anxiety could be genetic.  I think that anxiety of all types and fearfulness have a genetic component, in humans and in canines.  The causes are undeniably complex, but the role that genes play in the condition can't be ignored.