Bart gets in trouble on Grandparents Day at school and is forced to hang out with Skinner's mother as punishment. After spending time with various grandmas in the neighborhood, he learns the benefits of hanging out with the elderly, but eventually recognizes the dangers of taking advantage of them. Meanwhile, Peekimon Get has taken over the town of Springfield.

When Homer's court case determines that a dog's life is more valuable than a human's is, the status of man's best friend rises in Springfield. When the dogs recognize their new position of power, they assert their dominance over the humans.