I was all set to reply and ask you if you had talked to ParNone, but I see she has already responded.

I think it's a good idea to wait and see how he is after summer. You're bound to have more time for him during the summer, without restrictions like school, and you can really work with him.
I have a friend who has an Australian Cattle Dog. Izzy is a handful, and he works a lot, but he does kinda what Par suggested on tiring her out. He throws her ball up and down the steps until she gets tired (inside), or throws balls and frisbees until she gets tired outside. He said it takes her at least 45 minutes before she's tired, but it's worth it, and he spends quality time with her.

I hope everything works out, and Ozzy is able to stay in the home he knows and loves.