It's not just serotonin either-most neurotransmitters can cause anxiety or anxiety like symptoms, and in some cases an over-abundance of a chemical can lead to anxiety. So it does appear that you can develop it without experiencing a stressful life.
Howard Heinzl (1918 - 1989) With regard to blue American Staffordshire Terriers, any breeder that believes that a blue American Staffordshire Terrier is some how more valuable than the other recognized colours, is not only deceiving themselves, but they are also deceiving their customers.
As time went on the modern breed has become one with a temperament suitable for a pet and companion. It gained respectability, becoming a dog worthy to show, and was accepted by The Kennel Club of the United Kingdom as the Staffordshire bull terrier in 1935.he breed is naturally muscular and may appear intimidating; however, because of their natural fondness for people, most Staffords are temperamentally ill-suited for guard or attack-dog training. Staffordshire Bull Terrier puppies are very easy to house train.