Maxwell's Demon - The Adventures of Pavlov's Dog and Schrodinger's Cat, #1

The mysteries of the universe, a journey through space and time, and a cat and dog in the middle of it all. Pavlov lived a contented life, being an experimental dog for the great scientist Ivan, until, of course, the day the cat showed up. Schrodinger was very concerned that she may ... well ... not exist. Determined to solve the mystery of her existence, her search has led her to a very unusual dog.
Now the two must join forces to find their way through a mysterious building to find Schrödinger the answers she craves and Pavlov a way home. And the only clue they have may lead them to something called Maxwell's Demon... "Such a wonderful concept, and a better execution - this is the kind of book I always hoped to find when I was in grade school, and I'm just as delighted to discover it now." James A.
Owen, author & illustrator of HERE, THERE BE DRAGONS