"Dinah" wrote in
:

Is there anything on the market that would minimize the scratches. My
dog has scratched it badly trying to get out to get to a squirrel that
teases her daily. TIA

You can polish glass with cerium oxide and a *lot* of patience, but it's
not much fun. If you can feel the scratches with your fingernails, then
they are too deep to polish out. Here's a web site describing one person's
experience: http://www.bostonaquariumsociety.org.../scratches.htm