There are a couple possible plays on that phrase:
Adopted greyhounds rule the day! Of course they do. Adopt a greyhound and you'll understand exactly what I mean - they're just the best kind of dogs to have. Quick to bond, generous spirit...yes, I'm moderately addicted and completely biased. Why do you ask?
Adopted greyhounds rue the day! This, hmm, not such a greyt fit. I mean really, what do adopted greyhounds have to regret? When they come off the track to loving homes it's life in the