You have to watch him a lot. And if you take him outside and he doesnt use the bathroom then when you go back inside place him in the crate. When you let him out immediately take him outside. Also try to encourage him to go right when you go outside and then have some play time afterward so that he knows he is rewarded after using the bathroom outside. If you take him inside right after he uses the restroom he might try to wait as long as he can to go while he's outside so he can spend more time outdoors. Good luck