The Killing Fields tells the real-life story of a friendship between two journalists, an American and a Cambodian, during the bloody Khmer Rouge takeover of Cambodia in 1975, which led to the death of 2-3 million Cambodians during the next four years, until Pol Pot's regime was toppled by the intervening Vietnamese in 1979.
This movie contains 2 potentially triggering events.
There is no readily available information online regarding whether animals were harmed. Animals are, however, depicted as scared or injured in the film, and this film is from 1984 - viewer discretion advised.
There is a very brief, blink-and-you’ll-miss-it moment, where a stray dog is hiding under some porch steps, and it looks absolutely terrified from the loud gunshot noises. Happens right after the reporters are let out of the tank and witness someone get executed on their knees. I don’t know if it was a trained dog reaction, or a stray that happened to wander onto the set and the cameras accidentally caught the moment.
The film is about an armed insurrection, so yes. There are many guns pointed at characters throughout the film, as well as people shot both on and off screen.
After the scene in the wear house full of cola a cow is shown struggling to get up, I think it’s legs were broken or blown of. At 01:16:41 a few already dead pig are dragged out of a car onto the road it’s likely that they are being used to feed the embassy