A puppy that hasn't been housebroken and a curious cat are no match for a glass door. Pet scratches on glass look unsightly and can interfere with your view, but they can be removed. If the scratch is shallow it can easily be buffed out, leaving the glass virtually scratch-free. For deeper scratches, such as those deep enough to fit your fingernail in, consider replacing the glass door as removal is not an option.
Apply a drop of polishing compound to the buffing pad. Polishing compound is a fine powder used by jewelers and glass craftsmen for polishing gemstones and glass. It can be found at craft stores, glass retailers and home improvement stores.
Buff the compound into the scratch using a gentle, circular motion. As you buff, check in on the progress of the scratch by wiping the compound away using a clean cloth. Continue buffing until the scratch has disappeared.
Soak the sponge in rubbing alcohol then wipe the surface of the glass. Clean all traces of polishing compound from the glass.
Dry the glass using a lint-free cloth. The scratches should be less noticeable and faint. If they are still deeply embedded, contact a glass professional for replacement or professional scratch removal.