I need help finding a home for my dog! CBUS, Ohio?

The story begins like this... I got this dog as a four month old puppy from the pound. He is a great dane/black lab mix. At the time I had a huge apartment and everything was going great we were working on behaviors and commands. I would take him on walks and we loved our little life. I lost the big apartment because of a negligent roommate (she didn't pay her half of the rent for four months and the landlord didn't tell me). I couldn't afford to keep the apartment obviously. I moved into a very small apartment with not much of a yard. I figured it would still work if we still walked. It didn't and I ended up giving him to a family that PROMISED to take care of him. (I found them on Craigslist and they seemed very genuine) I told them that he was acting up a bit and that he would need some work before he would be happy again. They assured me that they trained show dogs and that he was in good hands. I got a call from a vets office saying that someone had found him. I called and emailed the family that took him and they never returned my calls/emails. I assume that they probably just let him go. I now have him in my house and I cannot take care of him once again. My living situation is not any better and while I love that he is here I just cant take care of him. He is a sweet boy but he needs more attention than I can give him. If I don't find a home for him soon I will have to take him to the pound. I love him but I really cant keep him. I don't want to see him miserable. He deserves to be with a family that can care for him and love him. He needs to find a forever home. What should I do? My time to keep him is running out and I don't want to take him to the pound.