You can put a small rug down, and some of the pet hair will accumulate on the edge of the rug, rather than under the harp. But it still gets under there, it’s just that the pet hair is camouflaged by the rug. Vacuuming the floors twice a week is the best way to keep your floors clean. If you don’t want to move the harp to vacuum under it I suppose you can to the lazy fix by giving one quick shot of canned air (used to clean computer keyboards.)