marking?

Question
please help!!  any advice! my 2 yr old miniature dauschund is having problems..  even though he has a doggy door and seems to know that he should pee outside, he will pee in the house like the dining room table leggs around my bed frame bottom of living room curtains, i rarely catch him in the act but i always will discipline him by calling him bad boy showing him then putting him outside, i have researches internet, books and his vet... my husband has had it.. im not sure what to try please help!!  any advice would be great thankyou!!

Answer
If he isn't fixed getting him done will greatly reduce this. Now,if that's been done the next thing to do would be to crate him at all times except to take him outside every few hours and feed him ect and do that for about 3 weeks and then slowly let him out more-and if accidents reoccur back in the crate he goes for another 10 days or so.