There is the Petrider waterproof type coverings for cars and they are very cheap. It might take two to include whole length of couch but until he is trained not to do that, that should work. Won't look good but should do the job.
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |