Gizmo goes outside and Piper is using wee pads, but eventually she will move to outside too. Right now she's super tiny, and cannot go down stairs yet. Plus, puppies go so often, it's just more practical. I'm pretty fanatical about my house, and I'd rather deal with a few months of pee pads instead of accidents on my carpet. *shudders* We transitioned Gizmo from wee pads to outside and it was pretty easy. Hopefully, when it's time, Piper will just follow her big brother's lead.