Bryant- So If you planned to create your own line how far back into the lineage would you look in order to determine whether the dog would be breed worthy to be the foundation of your linebreeding program?
If I were able to trace the lineage of a certain dog for many generations, I personally wouldn't start breeding the dog and try to label it "my" line of dogs. I think this happens a lot.
When breeding dogs, my intent would never be to create my own line, rather perhaps to try and re-create a certain dog. The more history you know the better, but you can start blind with a breeding as long as your honest with youself in evaluating the progeny.