I think you are providing a very valuable service for your group! Many adopters only want one dog (at first, anyway ) and most people work, so having a dog that was fostered in that environment would be great. Most greyhounds like being around other greys, but I think most do fine as only dogs. You will get a few that have SA, but don't feel like you have failed, you have helped them too, now the group knows not to adopt them as only dogs.