Urban dogs are more fearful than their cousins from the country
(PHYSorg.com Biology)

Fearfulness is one of the most common behavioural disorders in dogs. As an emotion, fear is a normal and vital reaction that helps individuals survive in threatening circumstances. When the fearfulness is excessive and disturbs the dog`s life, it is referred to as a behavioural problem. Excessive fearfulness can significantly impair the dog`s welfare, and it is also known to weaken the relationship between dog and owner.