Please correct me if I'm wrong, I know I have a lot to learn about these things but here's my take.
I can't remember which of Ed's videos defines the terms but it goes a little something like this:
The dog inherently has or does not have drives ie: prey, defense, fight or what not.
Now, the
temperament of the dog is actually the sum of those drives(plus maybe his overall attitude ie:dominant, submissive, nerves etc...), and how or what combination the dog uses them in order to get the task at hand done.
The dogs default mode (which I think is what Jenni is trying to say by natural drive/tendencies, perhaps
natural temperament would be a better term.).
Now each dog will have a "tendency" to use a specific ratio or combination of these drives consistently over any other combination, ie:70/30 defense/prey (meaning the dog will call on his/her defensive drive before its prey,(total speculation here))or 35/65 prey/defense or any other infinite number of combinations and possiblities, obviously it also depends on the task at hand. However each dog probably 90%or more of the time have a specific ratio they live in or perhaps their "core temperament" in which they reside or call upon for backup.
The Sports Arena is strictly a "standard" set by different cultures. Each culture has their own type or specialized working circumstances and/or environment which the majority of their dogs will have to deal with throughout their working career. Hence their specific sport is their interpretation of how to test their working dogs for the characteristics they ultimately desire. No one sport is the ultimate test for the truely perfect dog. Goes back to Geoff saying a kennel that produces dogs that work
through many different dog sports and
end up in various careers is breeding for strong, well-rounded dogs, and to be applauded.
The sports arena is in no way an end all goal rather a "Generalized Filter" to seperate the good the bad and the ugly. Personally I think roach backs are ugly. It's not a customized training plan for individual dog temperaments. Nor is it to enhance and build there natural temperament, although different temperaments will need different training methods or special attention to reach the different sport "standards". Hence the skill for reading your own dogs temperament, knowing the ultimate career of the dog, and knowing the different characteristics each sport tests for in order to enroll your dog in that sport would be ideal. That is, if you want to go with the sports. You can always just cut to the chase.
Certainly there are experts(not me) out there that after seeing a dog after a few sessions or some extended period of time can determine what that particular dog will and will not be capable of.
Now the development of sports for testing different natural temperaments or characteristics would be cool if you have the following (ie. a large group of people looking for the same traits or characteristics you're looking for).
Just my 2 cents...
I may be totally off here but I'm sure someone will surely let me know if I am. Please exuse punctuation errors I know some mods are sticklers about this.
Wow that was a longer post than I thought...