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.
turning a built-in desk into an indoor dog 'crate' with a simple kiddie gate. I might think of a more cottage looking "door" so it would look more "custom" but a good idea without having an ugly crate in the room.