Ruffland kennel sizing

Hey everyone I was thinking about buying a ruffland kennel but I’m unsure which size I should buy. My dog is 23 inches long from butt to chest and 22 inches tall from ground to top of her back. She is 50 pounds as well.

The medium interior size is Length: 26" Width: 17.5" Height: 18".

The mid size interior size is length 22.5” width 16” height 17”