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Odds and Ends
Old habits die hard
29 8, 7:00am
In that graph they use the re-breeds of Leonbergers though, they had other breeds like Newfoundlands mixed in against the incest. There are (or at least were) some breeders who never included these though and their Leonbergers are (or were, it's almost 20 years old news by now) a lot more inbred.
50 is actually a rather huge bottleneck compare to that the Leonbergers had after both World Wars (5 after WW, 8 after WWII).