Many dogs die throughout this series in a very brutal, unforgiving fashion.

Part 3 Episode 46: A cat is brutally killed during stopped time

A man jumps out of the body of an exploding horse. I believe the horse dies in the process.

A few frogs in part 5 die.

In like the first 15 minutes

A stand fight in part 3 specifically revolves around the destruction of teeth in a giant mouth the main characters are trapped in by a stand user.

Well... the "baby face" fight in part 5 could be...

I like to think the entire show is an anxiety attack.

Most notably in Part 3. The Tower of Grey stand resembles a Stag Beetle, the crusaders find DIO’s location using a photograph of a fly, and a character is seen eating live beetles.

Specifically in multiple fights in a dream world where the enemy is a grim reaper clown

Yes, at least two.

One character does make sexual comments about his mother before he realizes that she is, in fact, his mother.

In part 5 a character dies after his tongue is bitten by a venomous snake.

In part 4, a character kills and licks a spider. In part 5, a character is shrunken down and trapped in a bottle with a spider.

One of the antagonists in Part 2 crashes a car being driven by someone under the influence of alcohol to save a dog that is in the road.

There are no dragons in Jojo's Bizarre Adventure, as far as I'm aware.

Hand man go bye bye

Teenagers die in parts 3, 4, and 5.

In part 1, the main character’s father is killed. In part 4, a woman’s father (the main character’s grandfather) is killed. In part 5, multiple characters have backstories involving dead parents.

4 times

Everyone in part 5 is gay so

Depends on which Jojo part you’re looking at. Part 1 not so much, part 2 yep. Part 3 yesseroni. Part 4 yes or no depending on whether you were team Josuke or Team Kira.

A certain blonde boi; takes after his father

It’s par for the course in Jojo. Specifically, in part 3 the character Mariah has every bone in her body broken after she is crushed between two cars. She lives, however.

If we're talking an affair Joseph did on Suzie, and that's he Josuke came to be. If we're talking about otherwise, Jotaro did to defeat both D'arbys

Part 3 Episode 26

The fake Captain Tennile early on in Part 3 drowns to death after Jotaro hits him with a well aimed Star Finger.

Iggy the dog has a tendency to fart in people’s faces.

Polpo's like 700 pounds and all he's ever seen doing is eating

Not in the anime, but in part 6 a boy dies shortly after his birth and that's how half of the plot starts

In the Death 13 episodes Part 1 and 2 Noriaki Kakyoin and seen in a dream taking out a pocket knife. He is seen on screen cutting into his arm and the scars can be seen multiple times. Towards the end of Death 13 part 2 it disappears.

In Part 3, a character begins gasping for air after the oxygen begins being removed from a room. Multiple characters struggle to breath at different points while underwater.

Good boy Giorno no like drug

in part 3 there is an episode called “Justice Part 1” where a character named hol horse is forced to shove his hand into his own mouth and then he vomits. I had my friend skip over the scene for me but I know that there’s audio and possibly visuals.

The first main character to die to Part 3 is the black guy

Part 2, episode 1: Smokey is assaulted by police officers. Part 3, episode 20: a baby is made to eat its own feces. Part 3, episodes 32/33: Polnareff is de-aged and hunted down by Alessi. Part 4: Hayato is manipulated/threatened by Kira. Part 5 episodes 1 and 13: Giorno and Fugo are both abused in their respective backstories.

Only in one if the last fights in the part 7 manga

Also Formaggio for a bit in Part 5 Episode 11

In part 5, a 'doctor' (actually an antagonist) is seen temporary gaslighting a patient.

Yoshikage Kira is run over by an ambulance and many more

Some characters are mind-controlled by DIO

In Fugo’s backstory, he is nearly sexually assaulted as a 13 year old by his professor (he hits him over the head with an encyclopedia before it can happen) and it is implied that he had actually been before.

melone's behavior and stand is heavily implied stalking

The character Cioccolata has a reputation for torturing his victims, along with his partner Secco who records videos of the victims’ faces. The two are vaguely shown brutally torturing a gay couple early in part 5, and other grotesque examples of what Cioccolata does are listed. Also in part 5 is “the torture dance”, wherein main characters dance while another character’s retina is burned as his disembodied head is dangling from a fishing line by the eyelid. Despite how gross that sounds, it’s mainly played for comedy.

In part 5; a character is trapped in a glass bottle. Another is trapped in the closet of an airplane during part of a fight.

A character of mixed race is hanged by the KKK in part 6.

There are hospital scenes scattered throughout the series. None of them show treatment and are mainly just characters in hospital beds talking to characters who came to visit them.

Part 3 episodes 32/33 and Part 4 episodes 34 and 45

Early in part 1, Dio copes with depression by drinking.

Nazis appear in Part 2, although they do not explicitly show antisemetic behavior.

The more intense gore is usually censored. But blood and certain scenes are not.

In part 5 a woman gives birth in prison.

Iggy vs Pet Shop

Dio’s father is seen to be very abusive to Dio. It’s also heavily implied that this abusive behavor also killed Dio’s mother, further fueling Dio’s hatred for humanity and his father.

In part 3, a character’s eyes are scratched and he is temporarily blinded (not graphic). In part 5, a character’s head is dangled with a fishing line by the eyelid.

In the part 4 Stray Cat fight, a toenail gets launched off

A few character’s stands either have to do with or manifest as guns. Characters are shot.

At the end of part 2 and in certain parts of 3, Joseph is shown being racist towards Japanese people. In part 6, there are scenes involving the KKK wherein they beat and hang a man of mixed race. He survives, however.

Specifically in part 7 and 8, female characters are shown without clothes

Polnareff is seen getting a shave by a barber in Part 3.