magoo's_mama
Super Boxer
I would go over there and casually let them know that if they're dog becomes too much of a burden for them that you would be glad to take him, or even buy him if that's an option for you. Or maybe offer to walk him with your dogs or come over to play with your pups. Who knows they may let you, of course if they already think you may steal him they probably would not be interested. In the meantime keep harrassing animal control, its possible if you could get them to go check out the situation it might be worse then you think in the garage (is it air conditioned?) and they will take some action.
the best of luck
the best of luck