We tend to associate testosterone with more aggressive behavior, especially in males. (drjensdogblog.com)
Immediately after the law was passed, there was a surge in the number of cases of aggressive dogs in the city. (notabully.org)
One study found higher levels of testosterone correlated with aggressive behavior in 12 - and 13 - year - old boys, but not in 15 - and 16 - year - old boys. (discovermagazine.com)