Patient, consistency and persistence.
I took my Brandi almost a year but she came from a puppy mill and I have to admit, I wasn't exactly consistent with her. I sent her mixed signals so besides her stubborness, I'm pretty sure I was a lousy potty trainer.
It wasn't until I did the same thing consistently. I did the same routine with her until she got it. If she had a accident (I didn't scold her), I would just clean up the mess. Several times a day every day, I would place her on her pad and say "go potty". I did this for months. If she didn't go, no biggie but if she did, I made such a fuss....gave her treats. You would of thought she hit the lottery. I also didn't give her free reign of the house until she was fully potty trained. After that, she had full run of the house. That was important to me that she have that kind of freedom because she had spent mos of her life in a crate and I didn't want her to ever be confined again.
I also made it easier for her by basically putting pads down on favorite spots to pee. Also if you use treats, fair warning.......these little buggers know how to make you look like an idiot. My little one did the whole fake peeing thing to get treats. I'm pretty sure she must of be doing this for months before I caught onto what she was doing
. Outsmarted by a yorkie
Whatever you chose to do, indoor vs outdoor pottying.......BE CONSISTENT, PERSISTENT and PATIENT.......one day the light bulb will light and they will get it.