That depends on the pedigree and bloodlines of the horse
The largest racing horse is a thoroughbred. Secretariat is a thoroughbred for example
Canadian Thoroughbred Horse Society was created in 1906.
Ruffian was a thoroughbred racehorse.
Whether or not a thoroughbred race horse a filigree is a matter of opinion. Filigree means delicute or fanciful and whether or not that is how you describe a racehorse is up to you.
The state horse of Maryland is the thoroughbred horse.
Its a Thoroughbred horse bred with another different breed!
Thoroughbred
Thoroughbred
a THOROUGHBRED
a Thoroughbred
Purebread