Eight-year-old Sadi wants to find a puppy under the Christmas tree this year. She loves her two old dogs, but they don't run and play anymore. How can she convince her parents she's old enough to care for her own doggy? When they surprise her with a trip to the rescue home of Talia Wagger, it's puppy love at first sight. She gets the best present in the entire world—Max.

Max wants to be one of the lucky puppies who gets adopted. He cuddles up to his sister in the playpen to stay warm in the cold garage waiting for the humans to visit and hopefully choose him. When he sees the little human, he knows his wish has come true for the best home in the entire world—with Sadi.

A car ride, missing his sister, meeting Sadi's friends, learning what no means, and finding a way to get along with the two old dogs are only some of the adventures this puppy has once he's in his new home. But when he listens to Mom, who laughs all the time, and Dad, who likes to tease, and his little human Sadi, who gives him hugs and kisses, he understands—he's the luckiest puppy in the entire world.