Greyhounds are one of the best kept secrets as a pet, they are the friendliest dog I know and in all my time being around greyhounds i've never been bit (i've had more bites from Maltese's and Chihuahuas).
They are also know for their laziest, they are the fastest couch potato's around, 5min of "Zoomies" followed by 23hrs of sleeping.
If you are looking for the most friendliest loving dog for your next pet don't look any further than a greyhound.
Most states have an adoption program, for retired greyounds:
Victoria : http://gap.grv.org.au
NSW : http://www.gapnsw.org.au/home/
QLD : http://www.gapqld.com.au
SA : http://www.gapsa.org.au