Anyone bought used rig with musty smells or dog odors?

I still remember the day (way way back) my old man got into my chevelle and said "it smells like p***y in here", I never laughed so hard in my life, as I was out with a girfriend the night before (watching submarine races by the canal),,, it did not take long to air that out.
but hmm ya an rv the mattress would be the first thing that gets replaced and allways has.