I loved Morris

His real name was Lucky. Morris was a stage name.

Morris, previously named Lucky, was adopted in 1968. As the story goes, HHS staff members noticed the cat's charming personality and contacted Bob Martwick, a professional animal trainer who worked for the Leo Burnett advertising agency. Martwick recognized a certain charisma and star quality.

https://www.hinsdalehumanesociety.org/about/morris-the-cat

Whoever selected the voice actor who provided the voice of Morris was an absolute genius. I will remember those commercials to the day I die...they were great!

Morris was probably the greatest animal actor who ever lived. In addition to the Nine Lives commercials, he also appeared in "Shamus", a Burt Reynolds detective movie, as Burt's cat.