On the pedigree database Lance had 97 offspring but that's only the people who reigstered their puppies on the site. Right now most American lined GSDs are directly related to him (at least once). He could have easily sired hundreds and maybe even thousands of puppies.
A dog used that much, in any breed, can be very destructive to the breed. It limits the gene pool and all the "little" things start to pop out especially since it starts to get hard to avoid linebreeding. In a gene pool as small as the vlcak breed it could be devastating. What makes a gene pool healthy is diversity of good genetics.
As for numbers - vlcaks have a heat once a year (as far as I know) and their first heat is usually light. We can assume the good breeding years are 2,3,4,5. Maybe 6,7,8 if you push it. If someone is going to push one male this much then we can assume they'll try to get as much out of the female as possible, we'll say 2-7 (6 years inclusive). The average litter is 5 puppies. That's 30 puppies per female. That's a lot.
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