Dog pee on couch

My dog keeps peeing on my couch. I have no clue what to do. I clean it with vinegar because that’s suppose to stop him. I mean he literally lays down on the couch and pees. He then gets covered with pee then I have to give him a bath. I take him out and everything. I’m at a loss. He’s a year and 3 months old. He was potty trained. This just started happening