Cinematic liberties?
Here’s a chapter-by-chapter review of the original Steinbeck series:
Nowhere is there mention of buzzards attacking Jody & I honestly don’t recall it in the movie, but… OldLady Memory :o
Also in the book they do have to kill the mare & it is considerably more graphic, so I imagine was left out of the movie for that reason.
It is really not a kids book or movie, but Steinbeck was hardly known as a kids writer.
I must have been a morbid kind of kid…