On most horses it would be his/hers barrel.
A Clydesdale a shire horse is the largest horse breed, and many countries boast having the largest horse Images below-
The largest racing horse is a thoroughbred. Secretariat is a thoroughbred for example
The largest breed of horse tends to be the percheron but other large horse breeds are drum horse, shire, clydesdale, Friesian, or really any draft breed.
The Shire is the biggest horse so Shire stallions would probably have the largest penises.
The largest horse racing purse in the US is the $5,000,000 offered at the Breeders' Cup Classic.
Draught horses are usually the largest. Percherons for example.
Radar, the world's largest horse,is an impressive height of 19 hands, 3 1/2 inches tall == ==
as big as a horse
California
the largest part of the inegumentary is the skin.
The largest part of the brain is the cerebrum.
In Greek mythology, the centaurs are a race of creatures composed of part human and part horse.