Actually cats do not naturally hate dogs. ( they can be friends! do not get fooled by the cartoon! . many cats and dogs live together in peace or become close friends ( if you are trying to ask me why they fight ( Body language mix-ups: A wagging dog tail means happiness, but a swishing cat tail means anger./ Personal space: Cats like quiet and routine. Dogs like loud play and high energy./ Fear and size: Big or fast dogs can scare small cats, making cats hiss or run./ Chasing instinct: Dogs love to chase things that run, which triggers a cat's defense or panic. ( + sorry if it's too much :< )