Hi Donald…not all dogs do have a really obvious way of letting their humans know they need to go out. Some will bark or whine but others may just approach the door, see that it is closed and then look for an alternative solution. Installing a dog door can help, otherwise close supervision is key as is sticking to your toileting routine. It may help to restrict your dog to a smaller area of your home to make supervision easier. When toileting issues still persist in mature dogs it can be related to a behavioural issue, like scent marking or Separation Anxiety. We talk about this on my membership website…TheOnlineDogTrainer.com Best, Doggy Dan