puppy urinating

Question
My 4 mos old female puppy seems to be completely house trained. She goes to the door when she needs to go out every time, However she pees out of excitement, increasingly more and more often. At first it was only when my son came into the house. Now it seems to be when almost anyone comes in, people that she knows that have just come home from work. Last night she was playing on the bed with my adult son and his friend and she just squatted and pee'd out of excitement I think.
We tell her NO right away and take her outside however its too late and it always seems to happen when she gets excited.
Do I have something to be concerned about, or will this hopefully pass?

Answer
Many dogs eventually outgrow it, but you can reduce it by building the dog's confidence up.  Start with obedience training.  The key to most behavior problems is approaching things using the dog's natural instincts.  Dogs see all the people and dogs in the household as a pack with each having their own rank in the pack and a top dog.  Life is much easier if the 2 legged pack members outrank the 4 legged ones.  You can learn to play the role of top dog by reading some books or going to a good obedience class. A good obedience class or book is about you being top dog, not about rewarding standard commands with a treat. Start at http://www.dogsbestfriend.com/  As you praise the dog for following your commands, it will build its confidence.  

Play tug of war with the dog and lose.  However at the end of the game, take the rope or toy and put it up, less the dog becomes confused about who is top dog.  Ropes from the pets' store quickly turn to hazardous shreds.   Ones I made  lasted much better.   Go to a hardware or home center that sells rope by the foot.  Buy 2' of 3/4" poly rope. Melt the ends, and tie  knots in it.   Get them as tight as possible, put it in a vise and pound it with a hammer.  Watch carefully, and be ready to discard when it comes apart.

Finally, make sure it has a den to live in.  If you are not using a crate, buy one.  The dog may be happier in its den than loose in the house.  It relaxes, it feels safe in its den.  It rests, the body slows down reducing the need for water and relieving its self.  Dogs that have been crated all along do very well.  Many of them will rest in their crates even when the door is open.  I think the plastic ones give the dog more of a safe, enclosed den feeling.  Metal ones can be put in a corner or covered with something the dog can't pull in and chew.  Select a crate just big enough for the full grown dog to stretch out in.

A dog that has not been crated since it was little, may take some work.
Start out just putting its toys and treats in the crate.  Praise it for going
in.  Feed it in the crate.  This is also an easy way to maintain order at
feeding time for more than one dog.

Taking her out and letting her relieve her self before your son is due home and other times will help.