For some reason rats invaded my storage shed. Nothing in there for them to eat. They took up residence anyway, and multiplied. I tried poisons, traps, leaving door open for cats to search and destroy. After a while they all disappeared. Now they are in my house. Again I set out traps, did not catch a single one. Poisons, they avoided, or carried off and kept coming back for more. They are almost as big as my cat. She has killed a few of them, I worry about them hurting or killing her. She is a small cat and now old and a bit slower. What brand of rat poison have you used that works? Sometimes I can hear the nasty critters squeaking, and running around under the kitchen cabinet, gnawing on the cabinets. I can hear them in the walls too. I hate the nasty things and want them out of my house. What is an effective bait, poison that will not hurt my cat?