My dog killed my cat, what should I do with the dog?

today I got a dog from the pound, female pitbull mix, very calm and mature, 7 years of age. On the papers, it said that the dog was good with cats, and at first he was, but a couple of hours ago that proved to be untrue. The dog attacked the cat and bit into it causing the cat to die. I am very shaking and... show more today I got a dog from the pound, female pitbull mix, very calm and mature, 7 years of age. On the papers, it said that the dog was good with cats, and at first he was, but a couple of hours ago that proved to be untrue. The dog attacked the cat and bit into it causing the cat to die. I am very shaking and distressed about the whole situation, I really don't know what to do with the dog since besides this the dog is really great. I do feel some negative feelings towards the dog although it has only been 2 hours so I am not sure if that will pass. very unsure plz help
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