Another thing about when they pee when they are outdoors. Sometimes they don't let it all go at once. So that is why they need to go so soon after they just went - they still have some left. If you watch the pup outside, sometimes you can tell that they haven't fully emptied out. When you see that, you know that you'll need to make another trip outside in about 5 - 10 minutes. I found that if I was super vigilant, consistent and praise, praise, praise when outside - that really was the only way to stop Liyah (16 wks old) from going indoors.
It has been 2 weeks since Liyah has pee'd inside (she only ever pooped twice in the house and never did it again…not sure how I lucked out with that :D:D)...so hopefully it sticks :D. I think in my case it also helps that I have 2 adults that never go in the house, so Liyah has also learned from them.