WHYYYYYYY. Dog pee

My damn dog peed on the carpet today.

This is unlike him. He was home alone for 6 hrs so I feel like he did it out of anger since it is such a small amount.

Ive shampooed it with a carpet cleaner and also sat on my hands and knees for 30 minutes after allowing it to soak scrub the shit out of it.

There is still a stain and it doesn’t smell clean even after all of this effort.

Is there anything I can do, or is my best bet to get it professionally steamed out...