Here's why:
* Breed Standards: The American Quarter Horse Association (AQHA) focuses on performance and conformation, not height. There are minimum height requirements for certain classes, but no maximum.
* Individual Variation: Like all breeds, Quarter Horses come in a range of sizes.
* Lack of Central Tracking: There's no central database that tracks the heights of all registered Quarter Horses.
However, you can find some anecdotal information:
* Tallest Registered: Some sources claim the tallest registered Quarter Horse was a stallion named "Big Red" who stood at 16 hands (64 inches) high.
* Unofficial Tallest: Some horse enthusiasts claim to have seen taller Quarter Horses, but this is not officially verified.
Overall: While there may be individual Quarter Horses that are exceptionally tall, there is no official record for the tallest of the breed.