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.
Several Breeds go into the :American Bully but its really nothing else than a glorified mutt like a Goldendoodle or a Chorkie. American Pit Bill Terriers, Bulldogs, Staffordshire Bull Terriers, and Mastiffs are mixed in, in different combinations, depending on what they want in their American Bully.