All of my dogs came down with an Upper Respiratory Infection (URI) a few months ago. There was a lot, and I mean a lot, of sneezing and a lot of, um, well, there's no nice way to put it - dog snot. We don't know if the Bs picked it up at a show or if the lab picked it up at the kennel but after about ten days of antibiotics they were fine. Definitely not dry sneezes though.
Were there any other symptoms? His nose has been a little runny (little wet spots are left behind where his face was when he wakes up), and when he sneezes its a typical wet sneeze, but not a lot of snot other than that to speak of.