Yes, some dead seagulls and fishing

There are no dogs in the film

A seagull dies a horrible death by the hands of the mIn character

Seagulls are shown getting kicked and slapped several times.

There are no dogs in the film

No insects but several crustaceans.

There are no dragons in the film :(

There are no horses in the film

There are no cats in the film

There are no spiders in the film

There are no snakes in the film

There is excessive drinking of alcohol in this film, and the characters eventually resort to drinking lamp oil.

Alcohol dependence which later turns to lantern fuel dependence

Both main characters drink excessively, almost constantly through the second half of the film. In earlier scenes, there are also some scenes of one character pressuring the other to drink, which could be triggering.

Well, the final scene can be interpreted as torture.

They don't die from it, but there is heavy heavy implication of a character burning themselves and being incredibly injured from it

There is a scene where there's a dead body without an eyeball, it's short but can be triggering.

It's not seen in the film

There is a story about people losing their teeth from scurvy though nothing is shown.

There is no cannibalism in the film

One of the characters falls down stairs and while no specific bone breaks are shown, it’s certainly an implied consequence

No, but one character is missing a leg & the way he lost it is discussed several times. We never see the leg.

the head is not shown on screen

An ageing character who at one point referred to his "young'uns" dies toward the end. We only get that one mention of his children; we know nothing about them except that he abandoned them long ago. We see no pictures of them or anything. They likely won't even know about his death.

No but there are a few short scenes of the characters peeping on each other through the broken roof/ through the grate on the lighthouse. Super brief and I don't think intentional.

Arguably; characters are infatuated by a mystical “MacGuffin” as a significant plot device, and this influences their behavior in some significant ways, but it’s more obsession than possession. No possession by spirits, demons, etc.

Perhaps. I read that the film was conceived as a ghost story, and to be honest, what with all the hallucinations and general confusing weirdness, I can't say for sure that one of the characters wasn't a ghost from some point onward. My co-watcher said he suspected along the way that the character had actually died. As for me, I found it all a bewildering blur.

There are a few instances that can be jumpy, but it’s all very minor.

The lighthouse keeper, played by Willem Dafoe, farts a few times in the movie. The first time is even before you first see him. How is that for an entrance?

You can definitely hear the gore when someone is hit with an ax

at one point, robbert pattersons character attempts to throw out the contents of a chamber pot (both feces and urine). Unfortunately, he does this into the wind, and it all flies back and splatters all over him

After a night of drinking, Robert Pattinson's character throws up from his hangover. Directly prior, they wake up to a flooded house and Robert Pattinson is trying to pee into a floating chamber pot

While there is no body dysmorphia, there is body horror in the form of weird mutations, and blending of human & animal flesh.

Both characters become psychotic, and they get very violent, especially the younger one. However, neither of them has been diagnosed with anything; it's a case of "descending into madness" due to circumstances (cabin fever, you might call it). Whether one or both of them had some mental illness from the start, it's hard to say.

Majorly

definitely, lots of grubby eating and uncomfortable noises throughout the film. I think this eating noises are supposed to add to how uncomfortable the film, it is triggering but bearable

The movie is filled with claustrophobic scenes -- a feeling enhanced by the limited, almost square, aspect ratio.

There is a lighthouse (lol duh) so there is often a rotating light, but I wouldn't say quite flashing.

There are no children in the movie.

No pregnancies or babies.

No pregnancies or babies.

No pregnancies or babies.

No pregnancies or babies.

masturbation, sexual imagery

One character openly gropes himself while berating another. And at one point a character gropes what he believes to be an unconscious or dead woman.

there is no black guy

One character accuses another of being "slow" and a "dullard", in a manner referring to intellectual disability.

While neither of the characters are canonically gay, there's definitely some subtext that's been confirmed by one of the main actors.

You might argue that mermaids are spoiled, in that the mermaid that appears is malevolent and highly sexualized (genitalia, intercourse), but you shouldn't let children watch the movie anyway! The movie is as far from being a children's movie as a movie can get.

Sad isn’t quite the word for it, but it sure ain’t happy.

There are no planes.

The same character falls from a great height twice in the film. First non-fatally, and secondly from the top of the lighthouse and down the stairs.

There are no cars.

The two main characters do start to seem like a married couple, where some interactions and conversations could certainly be triggering to someone who has survived an abusive relationship

No, but it's mentioned that one of the characters abandoned his children long ago.

[SPOILERS] This scene is very graphic - we see dirt falling onto the victim's chest and face as he struggles to keep speaking and eventually suffocates. Near the end of the film, you'll see one main character leading the other on a leash like a dog; the live burial happens right after that.

No explosions.

No one dies by drowning, but a character has visions involving images of drowning.

No hanging, but a character wears a noose around their neck.

Attempted strangulation occur several times.

There are no cars.