My Loca was supposed to be cat safe, but instead she tried to kill my cat. Whenever I wasn't home, I kept her muzzled and separated from the cat. Whenever j was home, she was attached to my waste with her leash, and I monitored her every action. I praised when she ignored the cat, and corrected when she didn't. It took about 1.5 months of constant, consistent work, she eventually she and Linus (who was already used to dogs) became great friends.