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.
Fred, Lucy, the baby, and McDuff go to the lake for a Fourth of July picnic, but when ants consume all of their food it's up to McDuff to find something for them to eat.
While the popular Tiffany and athletic Charles make increasingly outrageous promises in their campaigns for President of Canine Country Day School, Otto quietly enters the race, vowing only to try to do what students really want.