The box size is great for an adult cat but I’ve had mine for a week and the front entry area cracked all the way to the bottom so I didn’t get much use and it was inside on a rug so it shouldn’t have whether it was a defect I don’t know but it’s a shame it would have been perfect for a senior cat. I can’t return it as I do t ha e the box due to the size. I had issues with a damaged product I believe due to shipping the first order I ever placed the box was crushed and the bed topper was damp so I paid for a bed topper I couldn’t use because I was told by customer service I’d be refunded but never was.