I am Special
The Greyhound is specially designed for sustained high speed running. While he is going at full tilt the dog's heart rate can rise to 300-360 beats/minute-this means that the greyhound heart can contract and refill with blood five times per second during a race allowing oxygen to be transported at a phenomenal rate to supply the needs of the muscles. His ability to reach top speed quickly is amazing. At maximum acceleration a greyhound can reach a speed of 45 mph (72km/h) within its first 6 strides from a standing start. No other land animal (except the cheetah) has that degree of acceleration.
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