One big difference is that greyhounds are bred for. sprint races--short bursts of energy at up to 45mph. Galgos are bred for endurance and can sustain a speed. of up to 40mph over long distances.

The dogs are often slowly killed by hanging them by their necks so that their hind legs barely touch the ground, swaying back and forth for days until they starve and die of exhaustion, or they are beaten with rocks and thrown into pits and wells without food or water, and sometimes even buried alive.