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Help my dog is going to kill my new puppy!

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So my american bulldog, ruby, is a little over a year old. we introduced a new american bulldog puppy to our home just yesterday. I have read several times that the dominate dog, which in this case is ruby, will express there dominance through aggression. this was to be expected, but ruby seems to be a bit overly aggressive. she will unexpectedly lash out at the little puppy. ruby has done this probably about 5 times already. during these times of aggression, treats and toys have been absent; it seems to be random, without even a growl of warning. not only is there no warning for these attacks, but the puppy is minding his own business rather than pestering ruby when she lashes out. I have to physically pull ruby off of the puppy. I become so frustrated that I put her in her crate to remove her from the situation. I'm not sure what to do with her or even the puppy after these bouts of aggression. what do I do with both dogs after this happens? how can I prevent it from happening? I would like these dogs to at least learn to tolerate each other, what steps can I take to do so?