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.
In the original series: Petey was an American Staffordshire Terrier In the 1994 movie, Petey was an American Bulldog Little known fact, the ring around his eye was not an actual marking on the dog, but was done with make up by a make up artist before filming.