When she needs to go out. I think we are getting there with our 20 week old scottie pup who is just bloody ADORABLE. Take her out every hour, does her stuff and knows she gets a treat and has done a Good Thing. Is mostly fine between taking out times but she is still having 1-3 accidents in the house a day if we take our eye off the ball for a split second and will not let us know in any way, shape or form that she needs to go out.
Interestingly and for info, she is dry all during the night, sleeps through and if she happens to be alone in the kitchen (her place).
Just a matter of time, right? Im sure our previous dogs were more on it by this point. Will forgive her of course because of huge paws and lovely puppy ways.