Hi Desertdog,
I used to witness my mother-in-law's sheltie lick the urine of my dogs when I visited sometimes. From what I understand, wolves, and of course dogs too, lick urine to determine if the other dog who urinated is a female in heat or not. The sheltie when he did this was an unneutered male, and from what I understand it is much more common behavior in unaltered males. It's just an instinctual, mate seeking response. It's not really something you can stop him from doing as he is just following an instinct, but you can simply try to call him away when he's sniffing at it and distract him to try to break the habit.
I hope this helps.
Edit: I also found this old thread with a similar question and a more detailed explanation: http://www.petoftheday.com/talk/show...?threadid=1018
And another little piece about it: http://www.labridge.com/chow/site/pa...kingurine.html
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