This question has already been asked and answered here on eNotes. Here is a link for you: http://www.enotes.com/poetry/q-and-a/needed-explanation-poem-cat-by-eleanor-farjeon-188981
Please remember that poetry interpretation is different for everyone, and what I am offering you is my interpretation of the poem.
For me, this poem seems to be very flat in meaning. The poem seems to be simply about a cat and the owner, or observer, or chaser (perhaps a dog?), is reflecting on what they are seeing in the behavior of the cat.
This is most obvious when the poem states "Wuff! Wuff! Treat her rough". It could also be that the dog, or chaser, is trying to get the cat out of the yard given the poems end: "Wuff!/ Wuff! /Scat cat. That's/ That".
Again, this is only my own interpretation. The meaning seems relatively simplistic- an observation of a cat being chased. There does not seem to be any hidden meaning or analogies.
But, I could be mistaken!