World's worst-behaved dog breed, data shows.  

A dog's obedience can be affected by many variables.  

Coren's studies helped Stacker identify the breeds with the lowest working and obedience IQ. 

Coren calls their ability to learn and respond to directions and training a "measure of what the dog can do for humans." 

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Coren ranked 140 dog breeds by working and obedience IQ using statistically significant data.   

Coren tested the animal's problem-solving, obedience, memory, social training, and observation. 

Training quality and duration, environmental circumstances, and puppy 

personalities all matter, but how much does breed and genetics matter?  

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