The father’s ancestors are usually followed up up to the 5th generation in the bloodline concern. A breeding of ancestors in the 6th generation and older is not considered to be an inbreeding (however an inbreeding is not apriori a negative issue). Investigating of ancestors up to the 5th is not as easy as one could expect and it is enabled only thanks to the fact that a lot of kennels has placed pedigree charts of their beasts on their web pages. Even there are some gaps the main male bloodline of Danaos is present up to the 6th generation. Fathers of fathers are available on the Ancestors gallery page.
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Pedigree chart up to 3rd generation with pictures is presented on Hoity-Toity Gang kennel pages.