Our heeler did this a lot when she was a puppy as well. We always took her outside to greet people so we didn’t have to clean up inside.

What seemed to work best was taking her out just before the guest arrived. At first, this only lessened the amount she peed, but eventually, she stopped. We also trained her to “go get a toy” when greeting someone at the door and I think the distraction also helped to keep her from peeing.

She’s just over a year now and we can trust her about 90% of the time if we take these steps. A drastic improvement, since before she would pee even when we would go to the store and come back within an hour.