Big cats are very aggressive, and will sprint and chase down their prey, this can range from mobs as small as ants, to as large asdeer. This also includes the player. If a big cat is attacked by another mob, it will fight back. Like bears, big cats will attack other mobs when hungry. Once a big cat has made a kill, it will be satisfied and will not be aggressive until it is hungry again. Tamed big cats won't attack each other or other mobs, unless another mob attacks it first.
If your cat is struggling to breath and is not eating or moving, it could be a sign of trauma in cats. A steep fall, collision or dog attack can result in internal injuries, which can affect your cats lung capacity. An internal hemorrhage, intense pain, fractures or pneumothorax constitute as emergencies that can cause fast, superficial abdominal breathing in cats.
Rapid breathing (tachypnea) is a respiratory disorder characterised by abnormal breathing that is rapid and shallow.  It is caused by a reduced level of oxygen, mechanical disorders (where the lungs aren’t able to expand as they should, usually due to a build-up of fluid in or around the lungs), and physiological disorders in which the cat’s respiratory centre in the brain is over stimulated.
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