Sesame Street (1969)

S52E1 Elmo Builds a Robot Dog

Elmo, Tamir, and Alan are creating a robot dog for Norbert the Robot, but they notice the tail isn't standing tall and "waggedy" like Tango's. They come up with a fun idea: what if they take a wooden paintbrush and cover it in shiny foil? Let's give it a shot!