There are differences between Sweetie, my female golden retriever, and Coco, her daughter, who is completely black with a small white splash on her throat.  Sweetie does not have an angry bone in her body.  She is just that–sweet.  Coco is also very sweet but can be very insistent when she wants to go out.  Sweetie always defers to her kids–Coco and her other kid Tilla.  Coco likes her privacy:  sometimes she will go to another room by herself or if the dogs come in from the yard she may decide to stay behind.  Coco knows my bedroom routine.  By the time I make it to bed there she is lying on the floor on one side of the bed.  Coco when she gets excited may “mouth” you.  She never bites but she is the only dog to do that.  I love both of them.