Leonberger genetic diversity
Everyone talks about it, but what is being done?
What would in any case be an important contribution is the limitation of the amount of mating’s per male.
Here are 2 links to very interesting articles about how disastrous it can be to constantly use the same male’s) and/or their offspring.
https://www.instituteofcaninebiology.org/blog/the-pox-of-popular-sires