After performing CPR on a tased raccoon, Lisa discovers her calling to be veterinarian and becomes an intern at the local office, but learns a tough lesson when her neglected class hamster dies. Meanwhile, Marge moonlights as a crime scene cleaner for a little extra money, and the trauma of the gory scenes make her increasingly dead inside.

When Marge becomes obsessed with a Japanese style of living, the Simpsons must part with any item that no longer brings them joy. For Homer, this means finding a new home for the family pig. For Lisa, it means saying goodbye to her beloved sax

After a successful animal rights campaign, all dogs in Springfield are allowed to go where they want and do what they want. Pack mentality quickly kicks in and the dogs of Springfield assert their dominance by threatening the people.