Found in an article, “Suggestions for Nature Study,” by Elizabeth Downhour, in The Educator-Journal, Vol. 18, No. 8 (Indianapolis: Educator-Journal Co., April 1918), page 429:

Here is a little poem that every child should know. It has been set to music. Try to get it and sing it with the children:

I know a little Pussy,
Her coat is silver gray;
She lives out in the meadow;
She never runs away.

She always was a Pussy—
She never was a cat.
Her name is Pussy Willow,
Now what do you think of that?