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.
Staffordshire Bull Terriers have an average lifespan of between 12 and 14 years, whereas Boxers have an average lifespan of between 10 and 12 years. This means that you could â¦ expect a Stafford and Boxer cross to live for around 12 years, if not longer.