but also, what do you do when you catch him in the act?? Also, what do you do to reward the potty behavior outside?
There should not be a single time that your pup is out of your sight until he is 100% potty trained. That way, you catch as soon as it happens and can immediately say "No" and take him out side and say "go potty" as soon as he goes outside there should be a huge, you won the lottery party for him. Treating and everything!