My Red Rubber Boots is the song sung by Doofenshmirtz in Wizard of Odd after getting the red boots from Candace.
Doofenshmirtz: Well, my wardrobe, it used to be duller,
But now I got this one splash of color. Look!
I got Red Rubber Boots,
and I'm gonna go steppin' tonight.
Yes, I can go tip-tapping all over town,
(Doofenshmirtz gets cut off when a house lands on him)
"Dorothy": Golly! (and Toto barks)
Doofenshmirtz: Ughh, I didn't get to finish my song.
Since it shows Dorothy and her dog Toto at the end of the episode, it can be assumed that this whole episode might be the history before Dorothy came in the book and movie was based on, The Wizard Of Oz.