Evadere aut Stare?

Once I watched my cat,
Slither fat and slimy
Through a gap in the wood
Of my old garden fence.

I tried to be a cat,
One of feeble magnitude,
Not squeezing through,
But sticking.

I stuck like a fish,
Hung heavy by the lip
With my ragged flesh aching
And a defiant set grin.

Still not letting go,
Not slippery in the current.
I thrashed like a martyr
Till my time was spent.

And though I have been gutted,
My bones piled bare and dry,
I would rather be a betta fish,
Than that sly cat of mine.