Joe & Blue use a chart to keep track on their friends' favorite snacks.
This is the 1st in a row where Joe skidoos into the felt frame.
As a dog, Blue really shouldn't have chocolate milk as her favorite snack. In real life, chocolate can be toxic to dogs if taken in large amounts (although here it doesn't apply due to cartoon logic); and Blue's actual favorite snack is Blueberry Pancakes as seen in Can You Help?.
This episode was renamed to Blue's Charts in the UK version.