My transcription from the video on YouTube. I have boldfaced the words that are different from the version in the DT.

I'M GOING TO DROWN MY CAT
Words, Jeremy Patterson, ©1975; music "All around My Hat" as recorded by Steeleye Span.
As recorded by the Somerville Gentlemen's Band

CHORUS: I'm going to drown my cat,
Then I'll smother it with my pillow.
He's pissed all around my hat,
And he's going to have to pay;
But I'm not into cruelty,
So when I've done dissecting it,
I'm sending off the bits to the RSPCA.

1. Fare thee well, wee mog; you have widdled once too often.
I'm off to buy a dog that is clean and well-behaved.
You've never discriminated about the place where you're urinating,
So "Rest in Pee" will be the epitaph on your grave.

2. Well, to get you potty trained I have struggled till my strength,
Just like your bladder, has been drained all over doors, floors, and chairs.
How your metabolism keeps booming when you produce more than you're consuming
Is really quite beyond me, so kitty, say your prayers.

3. Then I'll take my cricket bat, which is made of finest willow,
And sort you out with that and my troubles at a blow;
But I don't envy St Peter as he waits at the gate to greet ya.
You wait(?) till he's not looking, then you'll widdle through his halo.