Isn't it neat? We see our whole house as our home, but puppies don't automatically see it that way. The trick is to explain it to them in a way they understand. Transcending that language barrier can be challenging, but it's so rewarding. And tools like x-pens, or crates with movable dividers, are kinda like human-dog dictionaries.We started out potty training Butters at 9 weeks old with the crate. Others in here are right that dogs naturally don't like to soil their den/bed area, but that's why the crate worked really well for us. Butters would not potty while he was in his crate and would hold it. Of course, this was while crate training him and making sure that he knew his crate was his resting/safe space. We made sure his crate was only big enough for him to stand up and turn around in so he couldn't potty in one corner and sleep in another; we've adjusted the size as he grows. Once he was doing that reliably for a month, we started to expand his area to an exercise pen attached to his crate. He's about 17 weeks now and doing wonderfully! Can't wait to continue progressing him with more space.