I had a similar problem and it helps to go outside with the dog and make sure it pees before letting it back in the house. If he/she has been out alone, you have no way of knowing how long it has been since he/she went. My 6 mo old border collie has been taught to urinate on command and will "squeeze out" at least a few drops for me, even if he has already gone, to be able to go into the house. That way I at least know his bladder is empty when we go in.
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