I have a 4yr old and a 14 yr old that were never allowed on the furniture. I could still tell when I came home (just in the past few yrs)that they'd been on the sofa. I'd point to it and yell and they'd lower thier heads, they knew but that didn't stop it. Now, I just lock them up in a closed room so I don't have to fight with them. Sometimes it doesn't matter when you got a dog and how you trained them, they'll try to change things around at some point. I'm lucky that I have a couple of rooms that don't really have furniture in them so it works. Good luck