My dog urinates when she greets people. Can this change?

My son's dog is a happy, well trained, well behaved, gentle and very loving dog. She seems to be socially well adjusted to people and all other animals.

When my son gets home from work he has to just open the door and let her out so she can pee when she first sees him.
Actually it is the same when anyone comes to the door, she pees if not taken out instantly, Also, when you greet her outside she pees.  Sometimes its just a little dribble, sometimes its a lot. It does not seem to matter if she has just gone....she will still pee. He was told this breed has submissive urination. I get the feeling she is just excited to see the person. Can this change?

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