It was one of their earliest recordings in 1964; there's a bit about it, and the lyrics, on this page about the Sessions / Anthology series.
They didn't write it - that was Little Willie John, Titus Turner, and James McDougal. I was trying to find someplace where you could hear it, but no luck. Do you know? Drop a line and tell me.
I didn't know Jane's Addiction had written THIS:
My cat's name is Maceo,
He's a little man in a cat's body
He yawns just like I do,
He's convinced I won't eat him
. . . rest of lyrics here.