I'll look to see if I can find anything else. So far, this isn't much help...
Why does our Yorkshire Terrier keep marking the furniture with urine? We've had him for 4 year's and he'll be alright for a week or so, and then he'll start doing it again. He is a rescue dog and we have a cat. Would having him neutered do the trick?
There are many reasons that male dogs will mark with urine inside the house. One major reason is being an intact dog. Therefore, neutering male dogs will usually decrease urine marking. When a dog has been marking for a long time, neutering is likely to decrease the frequency of the behavior, but may not eradicate it completely since the dog will have "learned" to mark indoors. Good supervision and plenty of opportunity to urinate at the appropriate location should also help decrease the incidences of marking behavior.
http://www.purinaone.com/online_vet_...Chooser=1#1198