Dogs enjoy creature comforts just like we do, and many dogs can be found happily lounging on the sofa. There's nothing inherently wrong with allowing your dog on the furniture, so long as he's willing to remove himself when you ask. Teaching "off" is a great way to accomplish this. Also, it's important that if your dog is allowed on furniture, should an occasion arise where you'd rather he *not* be up there, it's up to the humans to manage his behavior. No fair getting mad at the dog one time for doing something he's been *allowed* to do 50 other times!