Surely it’s the owner who’s the major problem? Allowing their dog to urinate directly on the balcony and then hosing it onto the lower levels cannot be considered acceptable in any way.
The owner should get the dog to wee on a pad/newspaper and then dispose of them properly as they surely do for its excrement.
That the noisy door announces the commencement of the wee issue surely compounds the whole matter?
As for the timing, well the dog isn’t the only animal that needs to empty their bladder in the early morning. 😉