It might be time to start better enforcing that policy you have about no shoes in the house. Outside debris tracked in with shoes or paws deposits itself on your gleaming hardwood flooring. Left in place too long, abrasive materials act as a kind of sandpaper, slowly abrading your flooring’s top coat. Every box that gets slid across the floor further dulls that top coat and brings you closer to the next refinishing or re-sanding.
Sanding your wood floor, while a great way to revitalize it, should not be a frequent event. Hard sanding with a drum sander rips off the top coat, plus a fair amount of the wood itself. Too many drum sandings can weaken floorboards. In fact, if you have engineered wood flooring, you should never use a drum sander, as it can chew through the thin top veneer layer down to the plywood base.