Hey Amy!

Sucks that your neighbors would do something like this. Why get the dog in the first place?

How long are your neighbors willing to hold on to him? Do you have any friends or coworkers that would be able to foster him until you can find him a home?Have you tried contacting rescue groups in your area? Perhaps see if anyone can foster him? You work at Petco; don't they have a board where people can post pictures for adoptable pets? If so, why don't you put one up. I would also post his picture and info at the local vets in your area. Try Petfinder.com. Post him in the classifieds as an adoptable pet.

Hope some of my ideas help.