male dogs will mark places that they feel is "theirs"
It's not surprising that he will mark a Comfy Couch as something in his possession
but you need to set the boundaries with him where he can urinate
You have to make the ENTIRE house off limits
The way you do this is watch reward and catch
Watch him when he is some place where he is likely to mark
don't let him be unattended in these places
reward him when he pees either outside or on his pee pads
and when you catch him in the act
it's AH!!!
and run him right to the pee pad
marking is an instinct for males so it's not that easy to break but it's doable