Here’s an easy way your dog can let you know he needs to follow the call of nature.
Hang some bells from the doorknob and your dog will quickly learn to associate the sound with the door opening.
Soon he’ll be nudging the bells himself to tell you it’s time to go.
Saying, ‘Outside? Want to go outside?’, and jiggling the bells for a few days every time your dog goes out can speed things along.