I trained our pug. I took him outside often --after meals and especially when I saw him sniffing around. Each time he did his business I had a small treat that I gave him as well as over the top effusive praise and petting. It didn't take him long to WANT to use the potty outside. He wanted the snuggles and treat. The transition to going on his own was a snap too. It just became natural to him to want to use the out of doors. It was tough that first week but we've never had an accident since. Good luck.