Have they given you the the final two dogs? Sounds like you basically need to backtrack the final two through their parents, backtrack the parents and so forth and so on.
I have all the dogs and the back tracking on handdrawn charts.
My problem is figuring out a way to do the on the computer so I can type in all the infomration.
and before anyone asks - I do not have a scanner - and wouldn't know how to use it even if I did!!!!