The American Temperament Test Society (ATTS) is a national non-profit organization that promotes equal and uniform temperament evaluation of purebred and mix-breed dogs.
The ATTS monitors temperament in regards to the dog’s stability, shyness, aggressiveness and overall friendliness, as well as the dog’s instincts toward protecting his handler.
The test stimulates a walk through a park or neighborhood where the dog will experience various stimuli- neutral, friendly and threatening. The dog is tested with sudden stimuli such as opening an umbrella, a well as tactile stimuli such as walking on plastic and a wire grate. The dog is also introduced to a stranger at different distance.
The pass/fail rate of the test is not necessarily measured by the dog’s aggression but how the dog reacts to the different situations and people.
As of February 2013, the American Pit Bull had an 86.8 percent pass rate- 755 dogs passed and 115 dogs failed.
In 2007, 2008 and 2010, the breed has maintained an average of 85 percent pass rate.