I found sites which support both sides of the issue. Here's a link to one which supports it:
http://www.jackrussellcentral.com/main/news/pages/two.php
My logic on this one, however, is that a bottle of hydrogen peroxide would have the same effect (minus the tail wagging

). And if your dog is anything like Buster, I wouldn't want him mashing all the dirt and other unidentifiable crumbs that are always on his tongue into any open cuts. If I had to use dog saliva as a disinfectant, I'd get him to spit on a sterile cotton ball! :D
On the other side of the coin, I would be much more inclined to agree with THIS article, which states that "When they lick you - especially if you have an open cut - they can pass on germs carried in their saliva or parasite eggs they may have in their mouths." Again, I'd stick with hydrogen peroxide or a topical antibiotic (that comes in a tube, no tongue attached!) for treating wounds. Here's the link to this site:
http://www.todaysparent.com/health_safety/article.jsp?cId=3285
I love to kiss Buster and get kissed in return, but open cuts are a break in the body's largest defense system (the skin) and should be treated with a sterile medication and then protected with a bandage of some sort. Just my opinion...
