Debjen has some really good advice. I've been doing agility for years and big dogs in general, far more than little dogs, have no idea where their back legs are. We had an Airedale that knocked down every single jump - and they weren't at the correct height for an Airedale because he was just learning.
We had an Afghan that fell/jumped off the dog walk because of the same reason. Going through a ladder or over obstacles on the floor and start off slowly until the dog realizes that he has a couple more feet that he can't see. I wouldn't be concerned about it. I think its very common in big dogs.
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