I got my Peka from a long friend who was tired of dealing with her pottying in the house. It was very sad. I asked if they had tried puppy pads and they told me that if they had to use puppy pads, they didn't want her, which was very sad. I didn't know what to expect when I got her home. However, I think alot of her issues was 1) I SWEAR she doesn't like wood floors--I dont know if its cold or what, but when she is on wood floors, she's more likely to potty and 2) they were home with her ALL day, (worked from home) and I truly believe she had something against them, kind of funny, kind of not. But they would take her out, and she would still go inside. However, I would take her out and she was fine, would go. We did have a few accidents, and every once in a while will still have a few accidents here and there but she is SOO much better than she was. They had never trained her on puppy pads and I put one out and she seemed to know and I came home and she had used it! I however did not keep her in the crate alot of the time like her previous family did. I rarely ever use it unless I'm at someone else's house and are leaving for a bit. She does great now in my room, and I leave a puppy pad out just in case.
I know another issue is when she was fixed I personally believe they knicked her..something..and damaged her in a way that sometimes she just cannot hold it, for example, she gets really excited someone walks through the door and pets her, etc. I have to train PEOPLE now, DONT pet the dog, let me pick her up or take her directly outside, and she doesn't piddle. Works miracles with that situation, so I'm not sure if yours is fixed or not, but if so, that could be something to look into.
Also maybe consider a trainer at someplace like petsmart that help with behavioral issues as well as potty training. And you the books for dummies are always good, not saying that you are, but very good ideas and they would have that at any Petsmart you go too, or should.
Anyways, best of luck to you!!!!