Wanted to jump in on this topic because I am experiencing a similar issue, except that the moment of urination is when I return home from an extended absence and it is accompanied by obvious submissive behavior.
Well, I've had my dog just shy of 1.5 months, so things are very early still... more or less. My pup has had a submissive urination problem that I posted about before and it would result pretty much any time there was any correction or firmness in my voice... (here is thread: http://www.dogforum.com/dog-behavior...rection-10299/
In any case, based on the advice, I've remained patient and consistent. The problem no longer really occurs when I am at home, even with correction or firmness in the voice (though he will still sulk/mope for a minute or two). So, our weekends are just great... hardly any issues (0-2 issues per weekend!).
So, at this point, our issues are usually Monday through Friday... lunch and evening when I return home from work.
As I approach the door, I can hear the dog running toward and barking at the door, thinking its an intruder etc. (Normal behavior). As soon I as open the door and he recognizes that it is me, without saying a word, the dog instantly gets submissive and urinates as he creeps toward me.
(I notice that he is also quite "aroused", if you know what I mean, any time I return home.)
I am also crate training the dog and this issue does not seem to happen when he is crated, although he is in a similar state of arousal... but he doesn't mope and usually does not urinate. But, since I have a large house and a large contained backyard, I'd love to let him roam while I am gone 8 hours a day (2x 4 hours as I still come home for lunch to be with him).
So, knowing that this is a very sensitive dog, my guess is that he feels my leaving for hours is a punishment and, when I return, he is showing me the submissive behavior as a result.
Any ideas? Am I off base? How can I get him to realize that I am not upset with him because I leave for work every day?