Reddit comment:

Cool video. Miniature Zebus originated back when South Indian farmers preferred to have small cows which are more tolerant of hot weather. Also they could easily transport them on their boats (some states like Kerala have more canals than roads).

https://en.wikipedia.org/wiki/Miniature_Zebu

300+ Reddit comments:

https://reddit.com/r/videos/comments/59gowk/til_miniature_cows_are_a_thing_and_they_are/