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What Is the Undistributed Middle Fallacy?
The undistributed middle is a formal logical error in which two categories are connected through a shared middle term, but the middle term doesn't cover all members of at least one category. The conclusion draws a connection that the premises don't support.
Also known as Formal Syllogistic Error, this is a formal fallacy — the error is in the logical structure of the argument itself.
How to Spot It
Example
"All cats are animals. All dogs are animals. Therefore, all cats are dogs." "Animals" is the middle term, but it doesn't connect cats and dogs — it merely includes both.
A Stronger Version
"Cats and dogs are both animals, but being in the same broad category doesn't make them the same. They share the animal kingdom but differ in species, behavior, and biology."
Warning Signs
- Two groups linked through a shared but not fully connecting category
- The middle term isn't distributed (doesn't cover all members)
- Conclusions about group identity from shared group membership
- A is C and B is C, therefore A is B
How to Fix It
When an argument connects two things through a shared category, check whether the shared category is broad enough to include many unrelated things. Sharing a category doesn't make two things equivalent.
Paste your text above to scan for undistributed middle fallacy patterns and other reasoning errors. Each flagged passage includes an explanation and a suggestion for making the argument stronger.
Related Tools
Try our grammar checker to catch errors automatically, or use the paraphrasing tool to improve sentence clarity.