I know several Coons that are really small.
They usually don't get very far in shows, but they are pedigree Coons, all the same.
If people keep cats for breeding or showing, they usually dump the ones that are not champion material (undersized, lack of eartips, tail not long, straight or bushy enough, etc)
A Dutch forum friend of mine has a calico coon she lovingly calls her bantam cat
I used to have a midget-sized blue tom you would have sworn was a pedigree British shorthair, but less than half the usual size. We called him the Shetland cat (= miniature British), or our Italian Stallion (undersized, incredibly macho and a true mummy's boy)