Every line playsout sooner or later and has to be outcrossed.U cant keep inbreeding but so long.I have had yellow dogs close to 20 yrs. and do not see what I saw 10 yrs ago.maybe I dont know how to breed dogs but have been outcrossing to bolio/boyles blood the last few yrs and am getting more of what im looking for.Could also be my taste in qualities has changed as I get older.