What is the name of the fastest filly in horse racing?

Answer 1

Most likely Black Caviar she is a true legend she has one all of her 13 start never out of the winners circle

also Phar Lap he was a true legend and with makybe diva and So You Think they are the fastest racehorses to ever race on the planet

Answer 2

Of course , none other than the great Secretariat with the speed record at the Kentucky Derby of 1.59.40

Answer 3

Ruffian?

Ruffian, definitly

Answer 4

The great "Big Red" Secretariat