Intrinsic Grey Publishing

Where the Seen and Unseen Meet.

Somewhere between consciousness and dreams, imagination knows no boundaries.

What lies beyond closed eyes?

A quiet shade of grey. A world without boundaries. A place where time, possibility, and imagination intertwine.

We believe the greatest stories begin in the spaces we cannot see.

Close your eyes. Discover another world.

Portal Dog

Every adventure begins with a little curiosity.

What if the world we know is only the beginning?

When three brothers—Nico, Gio, and V—and their extraordinary dog, Quinn, discover a portal to another dimension, an unforgettable adventure begins.

From prehistoric worlds to unimaginable realms, the Portal Dog series takes young readers on thrilling journeys filled with mystery, humor, friendship, and discovery.

Different worlds. Endless possibilities.

Explore the Portal Dog series
Book One

Portal Dog: 9,999 B.C.

by K.K. Dio

Quinn is more than just slobber and fluff. He’s a Portal Dog! When 5-year-old V accidentally triggers Quinn’s mysterious portal, he and his older brothers, Nico and Gio, find themselves hurtling back in time to the ancient world of 9,999 B.C.

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The series, in order

  1. Book One 9,999 B.C. October 2026
  2. Book Two Over the Rhinnbow Coming December 2026
  3. Book ThreeThe Beat Goes On and On and OnComing soon
  4. Book FourGood Day, SunshineComing soon
  5. Book FiveHigh HopesComing soon
  6. Book SixFolsom PrisonComing soon
  7. Book SevenEugene GenieComing soon
  8. Book EightDiamonds in the SkyComing soon
Front cover of Portal Dog: 9,999 B.C. by K.K. Dio
Back cover of Portal Dog: 9,999 B.C., with the book description
Book One

Portal Dog: 9,999 B.C.

by K.K. Dio

Quinn is more than just slobber and fluff. He’s a Portal Dog!

When 5-year-old V accidentally triggers Quinn’s mysterious portal, he and his older brothers, Nico and Gio, find themselves hurtling back in time to the ancient world of 9,999 B.C. Will they survive? Will V remember how to open the portal so they can return home? Will Granny Sunshine save the day?

Order on Amazon
Front cover of Portal Dog: Over the Rhinnbow by K.K. Dio
Book Two

Portal Dog: Over the Rhinnbow

by K.K. Dio

A new portal. A world of color. A whole lot of trouble!

Just when Nico, Gio, and V think their adventures are over, a mysterious new portal sends them spinning into a bizarre world where everything is RED! Rocks rain from the sky, a mountain holds a disgusting secret, and getting home is anything but easy. Can the brothers escape this strange world, or will their next adventure be even more colorful?

Coming December 2026