In most clubs that I have been in/to, dogs are 1. genetically programmed to be "prey monsters" and 2. trained all in prey -
it falls to the handler/owner to either correct the training (and good luck with THAT in many clubs!!!) to test the dog. Personally, my female would spit out and go over the sleeve to the helper who felt this was a problem to correct....we did teach her to work in prey on that helper....but it did not change her genetics, and as an older dog, worked on a few Czechs, Dean C., Marcus, Bob, and other experienced helpers, it is obvious that she has true social aggression and strength.....
Thus, it falls to the breeder to understand what he sees, and breed selectively to bring the upcoming litter into balance.
But the 'extreme prey' dogs are what is highly sought for sport by most, and thus the IMO downward spiral of temperament and nerves
Unfortunately, too many dogs, especially those who are "high sport" dogs have no real social aggression.....the extreme prey exhibited by many sport dogs is what you have genetically....and those are the winning lines, the popular lines....as a buyer, esp a novice, these are the dogs and kennels that recommended constantly and IMO this is an issue that is just as much a black hole for the breed as the lack of courage in the show lines and the lack of everything work oriented in the ASL.
There are dogs out there who have and will pass on social aggression. Chuck Dorneberger Bach is a prime example....I have seen several of his progeny from a female of my own breeding who is a mostly prey dog.....they are much more balanced in aggression/prey than average.
As with everything - the letters after the name do not mean anything without knowledge of the dog's character.
Csabre Sch1, Hexe Sch2, SG Bengal, Lynx, Komet, Kira HGH & Kougar v Wolfstraum ~ Ziberia IPO1 ~ ATB Basha, Kougar & Kyra, Fenja, Sch3s, Cito, Sch2, Danger RH & Alice Sch1s ~Kelsey