A Growling Cat

I met one day a very angry cat.
His hairs were up all down his back.
Had piecing green eyes and his fur was black.
He growled and hissed for all he could.
I cried out “I'm old, stringy and not very good”.
Then I spotted what made him so angry and growl.
He had a big thorn stuck in his jowl.
I asked him to stand still while I pulled it out.
He growled and then stopped moving about.
I approached and yanked then tried looking impervious and stout.
He quickly departed down a track most likely his route.