I've seen lots of films where it states that 'No animals were harmed in the making of this film' but what happens if one does get injured? Do they have to say that something happened, or do the film-makers just not get to use the statement?
Almost all modern mainstream films involving animals are overseen, in America, by the Humane Society, and sets and scenes are carefully monitored, so it usually doesn't happen. If a film doesn't have that disclaimer, it just means that the HS weren't there, it doesn't follow that anything happened to any animal on set.
When they were making Batman Returns, penguins had to get strapped up to real rocket packs with firework sparks shooting out behind them. In a TV interview, a PR spokesman for the film company said 'It's part of the deal, they know the score'. Aye, right. So penguins understand and can sign contracts, can they?
See the AHA website at http://www.ahafilm.org/reviews.html
for a list of films, the status (acceptable, unacceptable etc) and a brief review ith the reasons. Its this site which American use and if a modern day film doesn't get acceptable then this impacts its box-office in the US.