My wife and I moved from a house in the suburbs to a condo in the cityWe have purchased a 3' x 3' Petapotty - real sod in a box - for our Yorkie to use on the balcony for the early morning and late night walks Unfortunatly, I have been unable to get him to try it outI have spent hours on the balcony with the dogI have used the traning spray available from PetCoHe simply won't urinate on the balconyAs soon as we go down the elevator he runs outside and does his business right away Does anybody have any ideas for me try?