Hurt it in what way did you hear this? Are you feeding live? If so any adult rat can hurt a Ball Python.
If your talking about feeding something to large and it cant swallow it then that not good either. Ive had a Ball “what looked like choking” try to spit it out. Took about 3 min for her to get rid of it. Best rule for that is no larger than thickest part of the snake. Balls are not like other larger pythons, their mouth does not stretch like a Burm or Retic. When my Burm eats its as if her head becomes a tube. The balls I have do eat much larger than their head but nothing like the way a Large Constrictor can.
I see a lot of Video’s where people are feeding huge Rats to Balls, its ridiculous and is hard on the snake for a long digestion period.
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