I had many problems as well and still do at times. Cooper is doing much better about doing his business but he has good weeks and bad. I HAVE to stand out there and tell him repeatedly to "go potty", just assuming he will doesn't work. What he has started doing a few times a week is catching me with my back turned while we're outside and peeing on the concrete patio

. I have no idea why he does this. My husband says that sometimes he thinks that Cooper's way of "giving us the finger" is to urinate in strange places. He definitely has a stubborn streak. To answer the original question it is not acceptable, but it happens.