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cornish
Well it just depends on what type of breed it is. Like the Thoroughbred, its the fastest breed, can run to 40miles and hour.
Thoroughbreds are generally considered to be the fastest breed of horse.
Greyhounds.
grey hound
grey hound
The fastest known breed of dog.
bantam
The greyhound is one of the fastest, but I think the Saluki could be a close competitor as well.
The fastest breed of dog is probably the greyhound but poodles love to run and are very fast.
Thoroughbreds are generally the fastest, as they are the most popular breed of racehorse. Quarter Horses can run the fastest for a quarter of a mile, hence their name, but are not the fastest overall. In other parts of the world, Arabians are also commonly used for racing.
I'm not sure if this is the fastest but it is faster than selective breeding. it is called genetic engineering