Removing Scratches from Hardwood Floors

Removing scratches or even gouges can be fairly easy. Depending on how deep they are will determine if you should start sanding with steel wool or sandpaper. You will want to use a grit that will remove the scratch without cause and further damage to the woods surface.
If the scratches have only penetrated the urethane you should just use steel wool the remove them. If you have removed to much urethane you may want to apply another coat (thin coats) You may also want to bluff it after it has dried (to blend it in. If you have scratches that dig into the wood you will have to sand them out. Then you will have to re-stain and then urethane.

Removing gouges from your hardwood floor may be a little tougher. There are two things that may work for you. You can fill them with a matching wood filler and then re-finish. Or you can fill the gouge with urethane to smooth it out. I suggest doing this with many coats, don't just pour it in and hope it dries.

They also sell touch-up kits for urethane that will help in remove scratches.