Peeing everywhere

My basset is now 1. He’s fully potty trained and goes to the back door when he needs to go out. He’s also now fixed. Lately, he has had major potty training regression. He’s peeing in our bed, in our carpets, the couch, the floor, and not even telling us he has to go. He just squats and pees. Doesn’t lift his leg like he normally does outside. I don’t know what it could be. I don’t think it’s a UTI because he doesn’t seem to be in pain.