He is regular for the most part, but sometimes out of nowhere he just goes off schedule and squats without warning.
I have this same problem with Louie, who is about 6 months old now, and still not quite housebroken. He has three houses to learn in though. At my house, he very rarely gets to roam around freely, so he will never learn to ring a bell or stand by the door or anything like that. I keep him confined in a playpen in my room when I'm not directly interacting with him.
He never has accidents in his playpen or when we're hanging out together in my room. He has had a couple accidents lately though when I've let him play with my roommates' dogs in the family room... he'll be playing along and as soon as I turn my head for an instant all of a sudden he has stopped playing and is peeing or pooing on the carpet
On the weekends we go to my boyfriend's house. I recently found out that my boyfriend doesn't watch him as closely as I do -- I sleep in and leave Louie under his care, and apparently Louie has found a corner of the condo to use as his personal bathroom spot. We didn't know for a while, it's a corner nobody uses, it just has some boxes piled up, etc. I've explained the rules to my boyfriend, but he never took them seriously until now. :/
Louie also comes to work with me, and he is very good about waiting until I take him outside. I keep him confined to my cubicle, of course, but I have found a couple accidents the last couple weeks, usually right before I was about to take him out, so pretty much on schedule, I guess he just got tired of waiting for me and just went.
It would be nice if he'd give me some sort of signal!
At work I was thinking about putting a little bell up in the cubicle somewhere where he wouldn't run into it normally, but could go over and hit it when he wanted to let me know he needed to go potty.
At the boyfriend's house, he will no longer have any freedom to roam, so I don't know how he would learn any sort of signal. He will always be leashed to one of us or in his crate if we're not actively interacting with him.
How do puppies who aren't allowed to roam around the house learn to go to the back door when they need to go potty? Or is this just something that you can't do until they're older and more reliable and have earned their freedom? I wonder what that will be like...