You're looking for the English translation of the French comic book series "Le Petit Nicolas" also known as "Rex" in some countries.

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The next day, I decided to bring Rex to school. I know, I know, it wasn't allowed, but I just couldn't resist. When we arrived at school, all the other kids were amazed. They had never seen a dog like Rex before.

Review: "Rex" (Le Petit Nicolas)

Genre: Children’s Literature / Humor Authors: René Goscinny (Text) & Jean-Jacques Sempé (Illustrations) Tone: Nostalgic, Satirical, Wholesome

This hardcover or paperback collection includes 17 stories from Nicolas’s summer holiday. The story "Rex" is typically the 4th or 5th chapter, depending on the edition.

While full translations of "Rex" from Le Petit Nicolas are often protected by copyright, you can find English versions and bilingual resources online, including the translated collection The Chronicles of Little Nicholas