The series follows Leonard Helperman, a 9-year-old boy in the 4th grade, who lives in fear because his mother, Mary Helperman, is his teacher. Because of this, he is often mocked and called a "teacher's pet", but he wants to be considered normal. Meanwhile, his dog Spot misses Leonard while he's at school, and yearns to be a human boy. So on the first day of the school year, he decides to come to class disguised as a new student named Scott Leadready II, who quickly becomes the most popular, influential kid in school. However, Leonard eventually finds out his secret. Although he disapproves of this at first, he allows Spot to continue attending school.

Main cast edit

• Spot Helperman/Scott Leadready II: (Nathan Lane; Kevin Schon in six episodes) Leonard's dog. He dresses up as a boy and attends Leonard's school. He's the most popular and doesn't want anyone to know he's really a dog. Usually at the end of the show, he will compare the episode’s moral or lesson to a historical event.
• Leonard Helperman: (Shaun Fleming) Spot's master and best friend. He's somewhat unpopular because his mom's the teacher, since the kids think it gives him an unfair advantage. But the sudden enrollment of Spot has helped him become more confident to a decent degree, due to the former's immediate popularity.
• Mary Lou Helperman: (Debra Jo Rupp) Leonard's mother. She is the perky and eccentric teacher of Leonard's class and embarrasses him. Just like all the other humans, she is too ignorant to be suspicious of Spot or tell that he and Scott are the same person.
• Mr. Jolly: (David Ogden Stiers) Leonard's neurotic orange cat. He is afraid of the outside world and stays at home with the family's parrot. He's in love with the principal's cat but his fear of the outside world (and her evil nature) prevents any chance of romance.
• Pretty Boy: (Jerry Stiller) Leonard's wisecracking green canary. He calls Spot "Dog Breath". He's an honest guy and loyal friend but can be mean, rude and grumpy to everyone. He sometimes bullies Jolly because he’s scared of everything.

Recurring edit

• Principal Strickler: (Wallace Shawn) The straight-laced principal at Leonard and Spot's school. He owns a cat named Talullah. He hates dogs because one nipped off half his thumb.
• Ian Wazselewski: (Rob Paulsen) The class weirdo. His mom is the school nurse, so he thinks he has a special connection with Leonard. He's a guy with a chronic upper-respiratory infection...a guy who keeps his scab collection in his desk. Everyone calls him "Eww-an".
• Leslie Dunkling: (Mae Whitman) Leonard's best friend and crush. She is very nice and lives next door to the Helpermans.
• Tyler, Taylor, and Trevor: (Pamela Adlon) Three of the coolest kids in school. Leonard wishes he was as cool as them. They usually participate in typical slacker activities like skateboarding. They sometimes pick on Leonard, but usually they are more socially tolerant of him thanks to Spot being his best friend.
• Younghee Mandlebom: (Lauren Tom) A Korean girl of the class who is Leslie's best friend. She is often mean to Leonard, but she still cares for him and as a matter of fact, she is secretly in love with him.
• Chelsey and Kelsey: (Cree Summer) Twins of the class who are friends with Leslie. They are usually stuck-up and think they are more important than everyone else, but they always bicker with each other. Leonard tries to get their attention, but usually fails.
• Moltar: Ian's invisible friend. Usually Ian likes to do the weird stuff he does with him.

The show aired on ABC's One Saturday Morning block beginning on September 9, 2000. The block would continue airing new episodes of the show until February 9, 2002 and reruns would last there until September 7, 2002, when the block was rebranded to ABC Kids the following week.

The show began airing on Toon Disney on January 7, 2002 with new episodes premiering on the channel starting January 11, 2002.^[3] Toon Disney would continue airing new episodes of it each Friday until reaching its finale on May 10, 2002. By the summer of 2006, it was removed from Toon Disney altogether and has not aired on American television since then.

The entire series was made available on Disney+ on launch day, November 12, 2019, in its original format.^{[4][nb 2]}

On January 16, 2004, Walt Disney Pictures theatrically released a full-length animated feature film based on the show in theaters, titled Teacher's Pet. The film serves as the series finale.

When Spot sees a mad scientist on TV who can turn animals into humans, he sees this as a chance to become an actual boy. Most of the actors from the series reprised their roles for the movie. The film received mostly positive reviews from critics, and was a box office failure, making over half of its budget back.^[7]

• Official website
• Teacher's Pet at IMDb  
• Teacher's Pet at Disney+