GO TO THE DOGS

If a place has "gone to the dogs," it means that it is falling apart and needs to be repaired because no one is taking care of it.

  image courtesy of dreamstime.com

Example:

Mike: Have you seen our old elementary school recently? It's really gone to dogs!
Pete: I know. I walked by last week and almost didn't recognize it. Several windows are broken and the the roof looks like it' s about to fall off. I wonder if they're going to fix it up during the summer, before school starts up again.