I know what you are going through. My little guy did this to me too. He even would get up on the sofa and pee and look at us. It pissed me off so much. I just stuck with picking him up telling him "NO" and taking him outside where i have a safe space blocked off for him and I would just leave him out there for a bit!
The wierd thing is he just turned 6 months and it was like a light switch that went on and he has not had another accident since. i think also the dog door we got him really helped this way he can go in and out when he wants and do his business. We have him going on the patio and I just rinse it off daily. Is this an option for you?
Best of luck - I empathize!!
__________________ Caren, mommy to Murphy and Mia  Murphy WUVS his girlfriend Trixie |