Oh, if I could only hum the tune for this one for everybody. I don't remember the name of it, but it sounds like it could be a reel or even another song. I remember Robin Williamson singing it in concert, interspersing with playing it on the penny whistle:

My wife's got a furry thing,
A furry thing, a furry thing.
My wife's got a furry thing;
She showed it to me Sunday.

It came from the furrier's,
The furrier's, the furrier's.
It came from the furrier's;
It's going back on Monday!

Teresa