Some folks are dog people, some are cat people. There are those, too, who have no interest in pets whatsoever. In any case, there might a story that explains it.
Write a cat or dog story. What has been your experience in living with a cat or dog? Is there a specific memory that comes to mind? Write about it. Was it funny, sad, scary, irritating?
If you don’t care for dogs or cats as a result of a particular experience, write out what happened. Did this influence your choice in having future pets?
What have you learned from dogs and cats? What is most intriguing? Most frustrating? What do you love most? What kind of relationship have you formed with a cat or dog in your lifetime?