Now that I've read more of your story, I agree that the dog would be far better off with your neighbor. The dog is neglected, out of control, and in need of someone who will give her the attention and training it deserves. You can't have a dog like that tied to a run line all day and expect it to behave. There are good, calm dogs that do "fall off the truck that way" but they still need training and to be taught manners. I hope you can come to a resolution that will work for your whole family.