Any animal, particularly this young and presumably not fully vaccinated, with respiratory signs, should be seen my a veterinarian. If your Kitkat appears to be in true respiratory distress, this should be considered and emergency and should be seen right away. Signs of true respiratory distress in a cat would be open mouth breathing, pale white to blue mucous membranes (open mouth and look at gums), fainting episodes, or resting respiration of more than 30-40.