Sorry to all those cat lovers in Freeperland, but cats are about as smart as a bag of rocks.
You have taken in cats that were beloved pets of someone else. Cats sometimes do not adjust well to new environments and new owners. It takes patience and love. I have two cats, each having belonged to two of my daughters. They are old now and have grown used to me. They come to me for attention and to be fed. They are loving, but not like the cats that I raised from kittens.
However, cats are very intelligent animals. The eldest cat, who is 16 years old, has decided that my 80 pound dog, who is 3 1/2, is not going to hurt her, and is therefore not going to keep her from doing the things she wants to do. She faces him down and will chase him out of the room if he disturbs her. She is right, too. Harm would never hurt her. He would only hurt someone who is a threat to me.