I have been seeing ads on TV for hanging screens at the door, used for letting pets in and out. My Sarah and Sam were raised with a pet door, and it was an adjustment for them when we moved. I decided to do a little research and found one of the screens for $22 at Amazon. Steve Holt installed it for me. The screen attaches to Velcro with the addition of a few tacks, and the magnets keep it closed. I’m sure it won’t do much to discourage mosquitoes, but I do think it would keep a bird from flying in. I was afraid the standard pet door wouldn’t work for Sarah as we have a step onto the patio. This hanging screen would also help with training a pup. It makes me lazy. When I watch TV or read I leave the door open, and Sarah and Sam enjoy their freedom..