I love labs. They are my heart. My first dog was a beautiful lab. That said, I believe any breed has a chance to be aggressive. Some breeds may have more of a chance than others, but I think it can always be possible. I have seen some scary temperament tests at work where puppies just eight weeks old have been shockingly aggressive. Sadly, they had to be euthanized because it was scary to imagine what they would grow up to be