Urinating even after being outside

Question
I have a miniature poodle that is 1 and 1/2 years old.  He has been fixed.  The dog urinates in the house at least 3 to 4 times a week.  We have a doggy door built into the sliding glass door, so he has constant access to the deck.  Our yard is not fenced in, so when have gated our deck for the dog.  There is not one particular place in the house he urinates.  Once I see the spot, I put his nose in it, tell him no firmly, and either put him outside or in his kennel.  What else can or should I do?  We have 3 kids (2 of which we already had when getting the dog) and it really concerns me having urine on my floors.

Answer
This is a difficult one.  I don't like leaving the dog loose in the house and expecting it to use a dog door.  It is difficult to change how a dog behaves when you aren't around.  I much prefer leaving the dog in a crate when unattended, but that isn't good if you are gone more than 4-5 hours.  If you are, you could try to have a neighbor or a professional dog walker give it a break.  

When you are home, praise it when it goes to the door, and when it comes back in if it urinates while out.  Watch it carefully inside and if you see it starting to urinate inside, give it an ''UT, ut, ut!'' and take it outside.  Learn to read it, and take it out.  Praise it for urinating outside.  It needs to go out the first thing in the morning, after eating, drinking, and sleeping. If it quits playing, and starts running around sniffing, it is looking for a place to go. Take it out quickly.

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/  You can find other ways to show you are top dog at http://www.dogbreedinfo.com./topdogrules.htm  All this may or may not make a difference when you aren't around.  Depends on the dog.