Cats' personalities can vary from breed to breed, but the most important factor in determining their personality is their environment. Cats that are exposed to more socialization, positive reinforcement, and variety of activities tend to be more confident and outgoing. Cats that are exposed to more stress, fear, and boredom tend to be more timid and shy. Additionally, some breeds of cats may be more predisposed to certain personality traits than others. For example, Siamese cats may be more vocal and active than other breeds.