Congrats on your new fluff! I think it will help that your other dogs go potty outside...I think that, in time, will encourage him to go too and you can just treat him like crazy when he does! Other ideas are to take his potty pad outside and put it on the grass and when he starts using it, gradually make the pad smaller until he is going on the grass. And you could also put a little patch of sod next to his potty pad indoors...then maybe with the pad on top of the sod and gradually make it smaller until he is using the grass. When you "catch him in the act" on his puppy pad indoors, say "Go Potty" until he connects the words to the action and knows exactly what that means...then you can tell him to "Go Potty" outdoors and he'll know what it is that you want him to do. Good luck!