Sometimes when you step on a cat’s tail, you get a very wild reaction from them. The high pitched shrieking along with fangs. Then you wonder that this is your pet cat and why is it behaving like a stray cat? They behave like Street cats because their DNA never changes. Whenever they detect threat, whenever they feel danger, that is how they react to it. It doesn’t matter if they are street cat or pet cat. They tend to follow their ancestors when it comes to safety.