If I were the breeder of the dogs or the family I would not go that route nor would I like to see someone else do it with my line/family of dogs. I have known people that would match into anything or anyone when they had one that gave them the warm fuzzies. Littermates, 1/2 brothers, 1/2 sisters, different families from the same breeder. It was a match to be won moreso than a line to be preserved or furthered. And if there is another side, I have met a guy that won't roll littermates on each other. He would rather school his dogs on others. Different strokes for different folks. EWO