Christina mentioned in comments (Thanks, Christina!) about a little ottoman for Boots. I found this one on Amazon for less than $25.
If it works, I’ll probably get another one to put in front of each bedroom window. It will be perfect for storage and will be a good place for him to sit and look out.
I will wrap it with an old sheet so I can wash it, and I don’t think it will show behind the little table next to my chair. It has memory foam on top so it should be comfy for him. It’s 15″ x 15″ x 15″ so it’s about perfect.
And, as Christina mentioned, it will give me more storage space for hiding my “stuff”.