It is doubtful that a horse will ever have six legs. It may happen through a malformation or mutation but it is unlikely.
Without surgery? Not anytime soon. It's very unlikely that will happen within the next 100 years.
A horse fly has approximately 6 legs on their body. Horse flies are larger than other species of flies.
6
Fore legs at the front and two at the back? Sorry I believe the answer is never.
A horse and rider
Horse, sheep, are two examples.
a mutant... or a genetically modified organism...
A person riding a horse.
The back legs of a horse is called its hind legs.
No. A quadraped has four legs. A horse has SIX legs. Two legs in the back, and fore legs in the front.
The function of a horse's legs is both movement and support.
a dead horse
All grass hoppers have six legs.