my yorkie is almost 2yrs old, i am still having difficulty with him not always going on the pads, my oliver likes to lift his leg & pee on the dining room table leg,. usually on or near where he needs to go. problem is my ollie somtimes dosent go out in the middle of the night either. very much an inside dog. i blame it on my not being home during the day (@ work). i think it is very doable but you need to be very diligent before they establish their bad habits. good luck, im still trying & wishing for better accuracy.
always reading & looking for suggstions