How would she be with cats? We have three....I love the breed, as my sister has two of terriers

She is a beauty. Do you think she could her own with a larger dog? I have a middle aged Standard Poodle, neutered male, and am concidering a second dog. Johnny is 66 lbs and although I like smaller dogs I am concerned about the size difference. Johnny doesn't have a mean bone in his body but he just runs and pays no attention to any other animal. He expects them to move out of his way. My son brings his Min Schnauzer to visit and have seen this first hand. Move Max move. What do you think?