He then bred the offspring back with German Shepherds to derive a dog with one quarter wolf blood.

[4] In 2019, a genomic study found that the amount of grey wolf ancestry possessed by the Saarlooswolfdog is 18–33% and the Czechoslovakian wolfdog 20–30%.

[5] The Saarloos Wolfdog is a strongly built dog whose build, coat and movement is wolf-like.

It is an athletic dog in build, with medium bone, and a strong and muscular body.

Following these meetings, Wageningen University and Research was asked to investigate the degree of interrelatedness of the population.

The scientists advised a controlled and extensive outcross program, to increase the breed's vitality, fertility and genetic variation.

The F1 is evaluated and fully health screened, and the best individuals are chosen to contribute to the next generation.

The F2 is again evaluated and health tested, and the best individuals are bred back to Saarloos wolfdogs to produce the F3 generation.