So we have been having good luck with Jens not pottying in the house. Last night we were outside and he did something twice I have never seen him do. He peed on Heidi (our female) while she was peeing. I assume he is trying to mark her?

Poor Heidi can't move as fast as she used to and I am not even sure she knew what he was doing. I have never encountered a dog peeing on another dog! I corrected him but he did it a second time. We had taken him off pottying on a lead because he was catching on, I guess he will have to go back to that so I can keep him from peeing on Heidi.