What a great, doggy book! In this YA, fantasy novel, Sirius (the dog star) is punished by his fellow luminaries by being sent to Earth to live (or die) as a dog, unless he can accomplish a seemingly impossible mission. The author does a fabulous job of portraying a character who is simultaneously canine and celestial. A wonderful book for all of us who already know that our dogs are mysterious, luminous, powerful beings beneath their furry exteriors.