Welcome to Echidna category greyhounds! These dogs are a great choice as a second (or third) pup as they can go home to canine siblings. The greyhounds in this group would be better suited for homes with no children, or children who are nine years old or older. While they enjoy having their humans around, Echidna category greyhounds can be left alone for up to six hours, and possibly longer with the right canine companion.