World’s Worst Pet – Vocabulary


Help your students build a rich vocabulary of essential words! World’s Worst Pet exposes students to over 1000 Tier Two words at 6 different levels through four engaging games. Aligned to the Common Core, this app provides student-friendly definitions, a playful narrative, a fun reward system and thought-provoking writing prompts!

World’s Worst Pet is part of i-Ready— an award-winning, blended learning program published by Curriculum Associates. Learn more about i-Ready at


World’s Worst Pet is structured to provide repeated exposures to a cluster of conceptually related target words.

  • Teaches more than 1000 words across five grade levels, from grades 4 – 8 with content available for students who are working a level behind
  • Student-friendly definitions provide clear explanations with rich examples that illustrate how each word is used.
  • Engaging narrative and reward system keeps students motivated
  • Activities include word context, word sort, synonyms, and antonyms.
  • Students see the same word multiple times in a single set of activities.
  • Includes Spanish cognates
  • Includes immediate feedback
  • Uses a real human voice not synthesized robotic speech
  • Aligns with Common Core State Standards
  • Writing prompts provide an opportunity to use words in types of writing identified by the Common Core


World’s Worst Pet leverages best practices from Reading research

  • Targets Tier Two words, selected from research-based lists.
  • Also targets domain-specific words, including science and social studies words.
  • Teaches words in conceptually related clusters
  • Provides clear student-friendly explanations
  • Provides multiple exposures and repeated practice across a variety of contexts
  • Helps students make multiple connections between words and their experiences.
  • Explores word relationships, including synonyms and antonyms
  • Includes Spanish cognates such as vehículo for vehicle or numeroso for numerous
  • Includes writing prompts focused on the target words in each cluster


World’s Worst Pet develops concepts, skills, and strategies as targeted by the Common Core.

  • “The importance of students acquiring a rich and varied vocabulary,” write the authors of the Common Core, “cannot be overstated.”
  • Tier Two words are central to understanding complex text, and World’s Worst Pet provides multiple exposures and repeated practice in these words.
  • Aligns with vocabulary standards in these sections of the Common Core State Standards:
    o Reading Standards for Literature
    o Reading Standards for Information Text
    o Language Standards: Vocabulary Acquisition and Use


Have questions or feedback?
Email: [email protected]
Phone: 800-225-0248
Monday – Thursday 8:30 a.m. – 7:00 p.m. EST
Friday 8:30 a.m. – 5:00 p.m. EST


Plan Price Details
World's Worst Pet - Vocabulary Free Compatible with iOS devices.


January 6, 2014

World’s Worst Pet – Vocabulary, by Curriculum Associates, LLC, in conjunction with ArtGig Apps, is a great way to grow students vocabulary skills. Students will stay motivated through great game play, as this app is a take on the ever popular Cut the Rope. That, combined with sharp knives, scary spiders, old attics, toxic dumps and so much more, kids LOVE it! Word definitions are learned in several different ways and the player(s) needs to be on their toes. This game is quick paced and formats change quickly. Snargg, the dog – otherwise know as the worst pet ever –…

Read more » World's Worst Pet

Curriculum Coordinator
November 8, 2013

The World’s Worst Pet Vocabulary App is an excellent resource for teaching Tier Two and domain specific vocabulary to students in grades 3-8. I also feel the app could extend beyond these grade levels. There are different activities designed to keep students engaged in vocabulary instruction including context clues, synonyms/antonyms, grouping/categorizing, etc. My favorite activity required the user to select the word that best fit with a specific book title. This not only helped with vocabulary acquisition; it also fostered critical thinking. I am very pleased that there is a section dedicated to parents and teachers that explains the research and importance of acquiring Tier Two and domain specific vocabulary in the CCLS. Different vocabulary sets focus on science and social studies topics that foster cross-curricular instruction. Finally, the World’s Worst Pet uses expository and narrative prompts that require students to apply their acquired vocabulary to their writing. I am extremely impressed with this app and would highly recommend it to teachers and parents alike!