In iwdb.org we are showing ancestor loss for our dogs. The ancestor loss shows how many individuals are “lost” due to repeat occurences in the pedigrees. The more unique animals available, the more genetically diverse a dog is likely to be. This is generally considered good for it’s health and for the breed’s health.
Due to genetic bottlenecks in the breed’s history and historical breeding practices, we don’t have any dogs with all unique ancestors, not even going just 10 generation back. For 10 generations, the highest recorded number of unique ancestors at the time of writing is 967 (out of a possible 2,046). The average number of unique ancestors for the litters recorded in 2015 is 583. For the breed’s genetic health, it’s a good practice to breed with more unique ancestors than the breed’s average.