It can be seen that Karl went through what is called Post-traumatic stressdisorder (PTSD) whenever he sees a cat.
<h3>What is Post-traumatic stress disorder </h3>
Post-traumatic stress disorder also known as PTSD, is a type of mental disorder or health condition which is generated by a series of events that happened in the past that led a patient to be anxious.
Most of the times, the events are not controllable.
Learn more about Post-traumaticstress disorder here: