Toby Terrier was a toy dog manufactured in the early 1990s by Tiger Electronics.
In order for this function to work a specific cartridge that matched up with the video being played would have to be inserted into the toy.
[1] Toby would wag his tail, bark, nod his head and say phrases such as, "Well, scratch my fleas!"
The video fields would send out a data stream that were received through Toby's neck collar.
The video also never faded to a pitch black but rather a dark-gray to ensure that Toby would not turn off during a transition.