I was just wondering peoples opinion on the all black presa? If you have had first hand contact with one, do you notice any difference between an all black presa as opposed to any other coat color? Differences such as temp., body structure, sharper mind, do you think that the black presa acts more like another breed? I ask that because a lot of people did not or do not accept the all black presa as pure! Secondly has anyone had first hand experience with an all white or prodominantly white presa? Are there more health problems, because of the light coat and uv rays and such? If so does the dogo argentino have those same problems?