I like Orville's response also....
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I noticed that agility as referenced when talking about tails... but how big is agility in Germany?
Im guessing, and dont have facts to back it up, that SchH would be the number one dog sport in Germany... and dont see where the tail or not would have to much effect on SchH...
The obedience is done on a paced scale with control being a factor... In the past I have seen posts regarding others dogs tracking fast and the suggested respose was to slow the dogs pace... and for the protection phase... I dont see where having the tail would effect it much either... maybe help with steering in the air when they are engaging in a bite midair. We all know that the rottweiler can catch a agitator with or without his tail... and I dont think his tail plays much role in his balance to do so... they have been doing fine from what I have seen in the past...
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If im wrong on any of this... I will glady admit my wrongness and stand corrected!
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Bear