A good working dog must have an excelent body construction for work without problems.
Imagine a heavy and displasic dog searching for lost people in one mountain with deep florest, normally he not will work 1/4 of the others healty dogs, after some working time he will only turn in more one "victim" who will need help making the people who work lost the precious time.
Different for sport dogs who only will work in test and training.
Endurance isn't exactly a working test, but is too, endurance nor test the behaviour of the dog, but test the body capacity for the dog work, too important as behaviour in a real situation.
A yung displasic dog can of course run all this, this dog must have strong muscles for not fell the problem and run all this, but when we talk about working dogs, this displasic dog will have a really little utile working time life, different of a healty dog with perfect body construction ( for endurance) that will work without problems even have his 9 or 10 years (normally dogs stop work with 8 years old).
No one working test are perfect, all they have little defects who can leave pass problematic dogs, one good exemple are some schutzhund GSD's who are very beautifull at work but aren't capable to take a bandit if needed, because they only bite the sleeve and continue bite the sleeve even when the bandit run away, won't be different with endurance tests.
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