Here is your starting point for converting animals to humanoids with motions.
Without this step you will not be able to use face features and visemes for making your animal talk.
It does not cover rigging (characterization) part, nor creating face blend-shapes. I just made one (Jaw Open as an example).
But there are plenty of tutorials from RL covering that (one posted above).
You must have your animal as a
prop with all motions already applied to perform.
In the video I use a characterization profile I have created prior (you'd have to characterize the cat yourself).