color of the claws / nails
 

According the standard the nails/claws of the czechoslovakian wolfdog should be black. Have ever other colored nails been observed in our breed or would that be a sign of mutation or cross-breeding?

Fenris.

Sometimes it happens that some wolfdogs have one or more white claws. It is considered a fault, but not eliminating fault. And it is definatelly not any sign of mutation or cross-breeding. Just nature.

White claws or a white spoting at claws not means too decreassing of pigmentation?

Yes. It is also the reason why it is a fault... If there are white claws it is also good to look if the pigmentation is not missing also on other places - we saw dogs with white stains on the muzzle or belly.
If there is a lot of missing pigmentation it would be a good idea not to breed with such dog...
But ONE white claw is not a tragedy because sometimes it can be caused by other factors than just missing pigmentation... ;)