Well I am certainly far from an expert but I did have two female poodles at one time. Our miniature was here first and then 3 years later we adopted a standard. The miniature was definitely the alpha dog. They never fought, but I noticed the miniature called all of the shots about when they would play, and even out in the yard the standard followed her around. I was wondering if the dog that was there first could have something to do with who is boss since it considers the home it's turf.