Seriously?!?

So we have these neighbors behind us. They bought their house about the same time we did. Two weeks after they moved in they started building a shed in their backyard. Well, it's been almost three years now and the shed is still not completed. I once saw them start a random fire in their backyard in the dirt at night. Neither of these have much to do with my point except to give an example of how trashy they are. Well yesterday it was raining all day here and has been getting as low as 30 degrees. Their poor dog was chained up ALL DAY in the backyard without shelter from the rain. They don't have a fence around their yard so they chain her up. We called the humane society on them twice yesterday and they never showed up!! It's illegal in California to have a dog chained for more than 3 hours. During the year I've ignored them doing this because they don't have a fence and I already get irritated by their two chihuahuas they have running around unleashed.
We have another neighbor who is a very sweet older lady that walks her four dogs everyday around the neighborhood. She came up to Jimmy late yesterday afternoon and said she was out walking her dogs when the son of my neighbor ran up to her to tell her that they are moving out tonight and aren't talking the dog. She asked Jimmy if we could take the dog for a couple of days until she finds a home for it or a no-put-down shelter. It happened so quick that Jimmy said yes and now we have a year and a half old pit bull mix in our backyard!!
As the trashy neighbor walked the dog over to our house Jimmy looked at it closer and asked our neighbor: "Is she pregnant?!?!" Our neighbor speaks hardly any English but told Jimmy that she's due any day now!! WTF! After the drop off the trashy neighbors were gone within the hour.
I'm so upset at these people!! To have a dog that they never payed attention to, chained up all day for most of it's life, don't spay it and then plan on just leaving it at the house you're abandoning while it's supposed to have puppies "any day now"!! I'm mad now because we're nice people and we've taken a dog that I wish the humane society had picked up yesterday like they're supposed to.
We can't keep this dog. Gypsy, one of our Labradors, is the alpha female and keeps trying to bite the pit bull. Besides, I never want a pit bull. I just don't trust them and especially this one who, I know, will probably have some behavior problems from these people. So now we have to shift the dog from one area to another when it's time for our own dogs to use the backyard. We called around today to every shelter and rescue in the area to get rid of this dog by tomorrow.
UPDATE: On Thursday we finally got a call back from one of the rescues, The Sound of Silent Spirits (Jimmy asked: "if they're silent then how can they make a sound?" Smart ass! ☺), they found a foster home to keep her at until she has her puppies and can be adopted!