Are you just…asking for the reason why it’s spelled ‘bred’ and not ‘breed’?
Same reason we say ‘purebred’. It’s a participle–the past tense of a verb used as an adjective. For example, if you see a sturdy building, you would say it’s ‘well-constructed’, not ‘well-construction’. A dog whose parents are the same breed is purebred, not purebreed. A horse of the Thoroughbred breed is thoroughbred–it is the result of thorough selective breeding for generations upon generations. It has, quite literally, been *thoroughly bred* for hundreds of years into the horse it is today. Ergo, it is thoroughbred.
The horse is not of the Thorough breed. The name of the breed of the horse *is* Thoroughbred. The horse is of the Thoroughbred breed.
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