I think I would go back to basics with this dog, If there's one thing I cannot handle it's dogs that pee on the bed!
dogs have to earn that priviledge and part of that is by demonstrating that they know not to go there (and don't)
I have one I cannot allow on the bed & one who sleeps there every single night without incident, some dogs who have weaker bladders just cannot hold it all night (my females issue) I'm not clear though if this is a dog bed your talking about? or a regular bed? that would help if you could clarify!