Optimus is just over 5 months old now. When we take him out, he has no problem going to the bathroom. But sometimes it's not always at regular intervals or regular times that he has to go, so he'll pee or poop inside. All my other dogs have always just stood by the door and barked when they need to go out, am I expecting too much out of a 5 month old puppy to start learning something similar? I've heard about a bell technique, where you teach them to ring a bell when they need to go out. I might consider this, but like I said, I've never had any problems with dogs just barking or sitting at the door. I know they say it'll be 9 months before they're fully potty trained, but it just feel like his training has plateaued... Any suggestions?