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  I also think that it's because he gets excited and probably upset when you leave him.  It's just the state of mind he is in for those few moments.  
 Perhaps - you need to put him someplace where his "peeing won't hurt anything" and leave him for a few minutes every once in a while.  I would think that he'll learn you'll be right back and not get so excited and upset after a while.
 
 I had a huge lab that would go to the bathroom in the car everytime I took him anyplace.  This was always because he got so excited -- not fun!   Then finally - after a million car rides - he finally got over this terrible habit.   It certainly was never because he was upset with me or anything like that.
 
 Carol Jean
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