Sophie, a young mouse, gets a very small Christmas present, while there is a big package for her little sister Jane, and she wonders whether Santa might have made a mistake.
On Christmas Eve, McDuff's persistent "woofing" begins to annoy Fred and Lucy, but it leads to the rescue of Santa, whose sleigh has gotten stuck in the snow.
Cover title. On board pages. "As seen on Nick Jr." "Based on the characters created by Rosemary Wells"--P. [4] of cover. "Based upon the animated series Max & Ruby"--P. [4] of cover.