Help: Our cat is NOT HAPPY about our new puppy

Meet Peanut! We just brought him home about a week ago and he is obviously adorable! BUTTTT... our cat Pepper is not a fan. In fact, puppy Peanut tries to play and the cat will actually tackle and try to strangle little Peanut, like she is attacking prey!

Whoa! Here's some pics... what would you do?