If you ever see them, you'll notice the difference. A black spot is nothing more than a birth mark. Just like people, some dogs have them, some don't. A Questionnaire I received Below is a list of questions I received, and my answers regarding labs. Read the info provided by the Labrador Retriever Club page .
Every lab is different.
Hmm, I'm on my first male, so not sure about that. They can be, if not trained properly, though it's not common. Again, every lab is different. Some are VERY dominant, some are VERY submissive, and they are all points in between. MOST are about average in this area, but I've seen all portions of the scale here.