Cat.

Doctor, doctor help me quick
I think I'm feeling very sick,
My tongues gone rough,
My skin's grown fur,
And I can't speak no more
I purr...

I really want to climb in trees
And suddenly I've got four knees
I've got sharp nails (they're almost claws)
And really sharp teeth in my jaws.

All I want is fish and milk
My fur's so smooth it feels like silk
What would you think
If I said that...
I think I've turned
Into a cat?