Melissa, do you know if this is a no-kill shelter? Many SPCA's are not. Is he in any danger?
Why on earth would they return him after 2 months? What kind of a commitment is that, adopting a dog who you know has already endured the loss of a home and the trauma of being in a shelter...and now he's back there, even more confused? How will he ever know where he belongs?
This just breaks my heart. Is there anyone in that area that might foster him?