In 1994, professor and researcher Stanley Coren wrote one of his most interesting books — The Intelligence of Dogs. His method for determining intelligence was how well the dogs responded to commands. Then Newsweek added some additional details.

For example, Border Collies are one of the smartest breeds according to the research, obeying commands on the first try 95% of the time. Meanwhile, the number one breed on our list only obeys commands 25% of the time or less. It’s a number that makes dog owners shudder.

When it comes to obedience, these 40 breeds are the worst of the worst. It doesn’t matter how many times you tell them to sit, quit barking, or that begging isn’t allowed. Your commands mean absolutely nothing to them.