Really interesting topic...
In the US, I have wondered the same thing...it's not a problem here yet, since (at least to my knowledge) the first litter has never been bred (although, I have seen some ads online recently trying to pass off mixes as Czechoslovakian Wolfdog mixes
- different topic...).
Most people that import to the US choose to import females - either because they want to breed their own litter, or want a dog that they believe will have an easier temperament. So, the pool of males becomes small - dogs that would be good for breeding much smaller. And good breeding males from genetically diverse backgrounds...very, very low.
Obviously, driving to Europe is out of the question from here - carrying an adult female (or male, if it was an option) by airplane is possible - but stressful to the dog, and very, very expensive. Also, most airline companies ask for reservations for dogs well in advance - this can be difficult to time with a female's cycle.
I'd be very interested to see the evolution of the process and local CSV population if breeders in Spain (or elsewhere) begin using AI as a means of breeding.
Best wishes,
Marcy