Make a Pet Lounge from Closet Space with a Mouse-Hole Entrance

My dog Comet began using the floor of my bedroom closet as a dark and quiet retreat. The floor has blankets and pillows and if I fit better, I’d climb in there for a nap too! The office is on the opposite side of the closet, and it occurred to me that it could be quite fun to make a large enough, cartoonish “mouse hole” for him to access the space. The project took just a couple hours over two days, and is used many times a day by Comet.