[Mist]

Hi,
the Czech plural for Československý vlčák is Českoslovenští vlčáci. I do not know it for sure in Slovak language, maybe Československí vlčiaci.
But be careful - Czech language is very difficult. Everything depends on in which sentence you want to use it.
For exampl:
Who? Czechoslovakian wolfdogs/Českoslovenští vlčáci
With? S Československými vlčáky
About... O Československých vlčácích
etc.

Isn´t it funny?