I liked the idea of two layers. All 3 of my dogs weigh less than 12 pounds. The 2nd plastic often trips over them, pulls them out of the bracket. Also a window. We have steps in and out, but little did we know the ante also had another 4.5" to 5" rise. That's a lot for small dogs. We've posted it both ways and still we're still having the same issues. For large dogs, this is probably a great option.
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