mstrk wrote:So, what can my wife do by herself home alone as she is watching her babies murder their sister in front of her eyes?
Poor Rosa was not their sisters, and even if she was it would have not matter, litter mates have killed each others after growing up together. The blood relationship is not important, household dynamics and social roles are. It is going to be hard for you to see the situation fairly if you think of your pit bulls, or any dog, as fluffy Disneyland characters. They are animals. You mentioned that you noticed that "Toby didn't like the way Rosa growled" and food was in the picture...what happens after that is a response to a conflict, and it does not make a dog "abnormal" to the point to euthanize him. When there is a fight, arousal is at high levels, there is prey like vocalization and another dog can join in.
I am a woman as well, with breed experience, and I know very well what happens when there is a serious fight in a multiple dog household. I am sure your wife has tried everything in her power to stop the dogs and couldn't. Been there, it is draining when you are alone and you have powerful animals that are set on killing each other, even when you are prepared.A breaking sticks does not solve a situation as quickly as some seem to think.I've never lost a dog over a fight, and I prey it never happens, because I don't want to live with the guilt of not being able to help them. Your wife was alone and probably had no plan nor was expecting any of this to happen. Sometime we learn things too late.
It is never the dogs' fault, let that be clear, and you have an opportunity to understand that with the help of those who posted here.If you cannot stand to look at those dogs find someone who can understand what happened and is willing to treat them fairly. If Toby is no longer in this world, that is the outcome of not learning enough about our breed and dog behavior.That is only on us, not on animals with a smaller brain than ours.