How to get him to let me know he has to go?
So Alfie is around 9-10 months old and for most of the time we had him he stayed downstairs. When he was downstairs, he'd let us know he had to go by sitting by the door and hadn't had any accidents in many months. In the last week, we've opened up the entire house to him (only while we're home) and he's managed to pee twice, and poo once within the span of a week. I feel like I need to re-potty train him. Perhaps the way I did it when he was a 2 months was wrong. I'd take him out every 2 hours, treating him outside, until he was able to hold it for longer. Plus he's fully crate trained, never had any accidents in there.
Any ideas on how to get him to let me know he has to go? Or any suggestions? Should I re-train him again? I've started to take him out again every 2 hours just in case he might have an accident, but I know he can hold it for longer and I'd like to get to the point where he'll sit by the door when he has to go outside.
Thanks for the help everyone!