As Sacha is a first cross (F1) from two different breeds she will exhibit hybrid vigor ( heterosis ). If she is crossed back to one of the parent breeds or a cross made from the parent breeds in whole or part, the offspring will loose the hybrid vigor. Crossing to a third and unrelated breed will maintain and increase the HV.
As pure dog breeds have a high inbreeding co-efficient, outcrossing to other breeds is a good idea and will in most cases produce a hardier, longer lived, more vigorous and all round better utility type dog than the pure parent breeds
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