I love these priceless diddys. I heard this one from an old fellow that I was chatting with in the grocery store beer section. I'm pretty sure he was in the early stages of sillyness, because his wife escorted him away when she saw him talking and singing to a perfect stranger. All that I could remember was "rats and kitty cats", so I began to Google and research. Also, I drive a school bus, and sometimes encourage silly behavior from my little ones - this seemed to fit the bill... It seems the chorus is perfectly acceptable as;

"Alley Cats and Long Tailed Rats"
"Long Tailed Rats and Pussy Cats"
"Rats and Dogs and Cats"
"Rats and Dogs and Kitty Cats"

The first go at it was very successful, the kids loved it and begged for more.
I modified it some to make it easier to understand and sing by modern American children and this is what I came up with;
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There was a strange old butcher, whose name was Dunderbeck
His specialty was sausage meat, and saurkraut, and speck.
Then Dunderbeck invented, a terrible machine,
That ground things into sausage meat, and it was run by steam.

Oh Dunderbeck, oh Dunderbeck, how could you be so mean
To ever have invented that terrible machine?
Now all the Rats and Dogs and Cats, will never more be seen
They'll all be ground to sausage meat in Dunderbeck's machine.

He had the finest butcher shop,the finest ever seen!
And that's where he invented, that terrible machine.
But people began to think, that something wasn't right,
When the Rats and Dogs and Kitty Cats went missing in the night.

Oh Dunderbeck, oh Dunderbeck, how could you be so mean
To ever have invented that terrible machine?
Now all the Rats and Dogs and Cats, will never more be seen
They'll all be ground to sausage meat in Dunderbeck's machine.

One day a little fat boy, walked into the store
He brought a pound of sausages, and threw them on the floor.
The boy began to whistle, and he whistled up a tune.
And all the sausages stood up and danced around the room.

Oh Dunderbeck, oh Dunderbeck, how could you be so mean
To ever have invented that terrible machine?
Now all the Rats and Dogs and Cats, will never more be seen
They'll all be ground to sausage meat in Dunderbeck's machine.

One night the machine got busted, the darned thing wouldn't go.
So Dunderbeck, he climbed inside to see what made it so.
His wife, she had a nightmare and walking in her sleep
She gave the crank an awful yank and Dunderbeck was meat.

Oh Dunderbeck, oh Dunderbeck, how could you be so mean
To ever have invented that terrible machine?
Now all the Rats and Dogs and Cats, will never more be seen
They'll all be ground to sausage meat in Dunderbeck's machine.