It is paintable
It is a good thing you can smell the litterbox through the hole, as a reminder to scoop your box at least once a day! If your litterbox smells bad to you, it is oppessively stinky and upsetting to your cat who has a much stronger sense of smell.
Yes, may require cutting down the sides of the cat door to fit as was my case.
Yes - We put it on a hollow core door - worked great.
To inquire about installation services please visit www.homedepot.com/services or call 1-855-752-3352.
It can be installed without the brushes. if you go to Chewy.com they have the same door with a video and they show you how you can install without the brushes.
Thank you for your recent inquiry with The Home Depot, cmf28. We do not offer a replacement brush. We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot.
Yes, the wood is stainable.
Depends on thickness of wall, pins and screws made for door thickness,
We have a largish cat too. Not sure, but probably around 15 lbs. She fits in there fine. The brush comes out, and we did have to remove it just because our cats wouldn't go through the opening with it in there.