Would be fun kid hideout space! Awesome dog kennel under the stairs design idea. If you want an indoor dog house, utilizing the space under the stairs for a cozy, attractive and practical space for dogs is a good idea! I love this design.
This modern dog house named Woof Ranch, features a deck covered in artificial turf as well as a small window in the interior of the house to create the indoor/outdoor experience often associated with mid century modern houses. --adapt for cat patio