Turn CAT into DOG
You will change CAT to DOG one letter at a time. Each intermediate spelling must be a real word, so a small change can still leave you at a dead end.
- Words
- Expert
- About 20 minutes
Grown-up needed: yes for preparation and any interview or delivery
What you need
- Paper
- A pencil
- A familiar dictionary with a grown-up
The rule
Change one letter each time. Every step a real word.
How to do it
- Write CAT at the top and DOG at the bottom.
- Change one letter of CAT to make COT.
- Find a word one letter from both COT and DOG.
- Write DOT between them to complete the route.
- Check every adjacent pair for exactly one changed position.
- Read the meanings with a grown-up to confirm all four words.
Why it works
A word ladder treats valid words as possible stopping places. Two stops connect when their spellings differ in exactly one position and keep the same length. CAT to COT changes the middle letter, COT to DOT changes the first, and DOT to DOG changes the last. This gives three moves across four words. Looking from both ends can help find a connecting stop. Not every promising spelling is an allowed word, so a vocabulary check remains part of the rule.
Make it harder
- Find another valid middle route if your word list allows it.
- Invent a different pair of three-letter endpoints.
- Explain why four written words represent only three changes.
Ask Taz
- Why are there three moves but four words?
- Why must each intermediate spelling be a real word?
- Why does searching from both ends help?
For grown-ups
Agree which dictionary and ordinary word forms count before trying a new pair. Help check meanings without supplying every next step. A dead end is a route to revise rather than a reason to invent a nonexistent word. Ask at dinner: “Which changed letter connected the two parts of your ladder?”
Taz is an AI and can be wrong, so stay close by. Read how safety works on Taz.
Show us yours
Film your hands and what you made, not your face or name. Ask a grown-up before posting anywhere else.
Questions parents ask
Does this need a polished written page?
No. Begin with a short attempt, and speak or sketch ideas before writing if that helps. Keep the stated rule visible and revise one useful detail. The time estimate allows a first attempt rather than promising a finished piece in a fixed time.
How should a parent respond?
Ask what the child meant and name a detail that helped you understand it. If a word or connection is unclear, explain your reading and let the child choose a revision. The activity is a conversation about choices rather than a spelling competition.
Do we need to post it online?
No. Reading it together at home is enough. Follow the privacy line above if you later choose to share.
More to try
See all Taz Challenges, or look through the science labs. One place for every why. Ask for early access at aitaz.com