Who did Sai Baba instruct to feed a black dog as an act of service, and what was the significance of this?

This appears to be a misunderstanding of events, as the provided texts do not mention Sai Baba instructing anyone to feed a black dog. There is, however, a similar story involving a different devotee and a different saint. As recounted in Chapter 0, it was a saint named Janakidas Baba who advised the devotee Kashiram to feed sugar to ants. Kashiram held this advice so dear that he always carried a bundle of powdered sugar, which he even protected from robbers at the risk of his own life.