yeah they are just colors and do not signify a bloodline. You have a black nose pup, like my boy. Without papers you can really know what your dogs bloodlines are and are better off just calling it a mutt or a pit mix. If your dogs parents are papered you could be able to tell from them what the lines are as well. Post up some more pics when you can!i always thought blue nose and red nose were bloodlines and clearly they are not lol, so because i thought she was a blue noses