A baby alligator is flushed down a toilet and survives by eating discarded lab animals, injected with growth hormones. The now gigantic animal escapes the city sewers and goes on a rampage, pursued by a cop and a big-game hunter.
It's subtle, but the father is emotionally abuse and toxic. He indulges her by buying her the gator then swing into rage without warning and flushes it
A character swigs alcohol when hunting the alligator, but it’s not inherently clear he abuses it. Probably not best to skull it whilst hunting a giant alligator, though…
At the beginning of the movie, a man is shown stealing dogs off the street and bringing them to an animal testing lab to be used for experiments.
in another scene, a scientist explains how they cut the larynx of the dogs so they can't make a lot of noise while they're in their cages. And then a couple of dogs pitifully try and park. It can be very upsetting for people.
The female character serves little purpose other than offering a book to the main character (so he can study himself, instead of the alligator specialist telling him, of course) and being a sexual/romantic interest.