The original mating established firstly - that progeny from male dog / female wolf & male wolf / female dog was possible & secondly - that offspring were themselves fertile & capable of successfully continuing the emerging breed.
As might be expected, the first hybrid puppies closely resembled the wolf & in retaining much of their characteristic behaviours, were difficult to train.
In adulthood, the first generation hybrid offspring were again bred with German Shepherds to decrease the wolf percentage. By third & fourth generation puppies, in addition to increased trainability, the evolving breed exhibited superior tracking skills, night vision & more acute hearing & scent capabilities in comparison to dogs.
Founding female Brita was mated to a second German Shepherd male called Kurt, which created the basis of a second line & a third was created by breeding male wolf Argo with female German Shepherd Asta.
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In 1982 the Ceskoslovenský Vlciak was recognised as a national breed via the general committee of the breeders' associations & officially recognized by Fédération Cynologique Internationale (World Canine Organisation) in 1989.