If your dog is not neutered (and maybe even if he is neutered but has a strong personality) he may be marking your property as 'his' by urinating on it.
Marking behavior is really common in male dogs who have a misunderstanding about who runs the house. It particularly shows up when dogs are maturing to where they would take over in a dog pack. Marking over your strong scents (beds and dirty clothes) is typical of territorial marking.
I 'read' this behavior as 'all this is Mine! signed ME the Alpha Dog!'.
You can work on changing his mind about his status and you can consider neutering him if he is not to see if that helps.
For a non violent mind changing method positive type obedience training paired with the nothing in life is free program works really well.
You can read bout nilf here
www.ddfl.org/behavior/nilif.htm
Hope this helps you!
Please press Accept if you find my answer helpful. Want more info? Just reply on your question!
Bonuses for good work are always appreciated!
Thanks for the opportunity to help you!