An ex-BF had a Yorkie who had been abused. He was almost a year old when the breeder found out about it and went and took the dog back. BF got it because sister gave to him to dog-sit and it became permanent ...
He was VERY food aggressive, prone to seizures, and if you frightened him, he turned violent. Otherwise, he was a pretty typical Yorkie -- spirited, playful and very loving. (I sure missed the dog after break-up with BF
.)
Fortunately, his problems were not as pronounced as Rascal's. (There's no way he could have kept the dog if they had been.) Dog lived to about age 13 or so and BF had to have him put down.
These are the kinds of cases that just make you sick.
P.S. : Cesar Milan is a dog trainer. Has a show on cable, "The Dog Whisperer."
While a rescue is a very noble effort, you might want to seriously consider whether that is a good fit for your family.