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

A few frogs in part 5 die.

In like the first 15 minutes

Iggy vs Pet Shop

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

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

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.

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

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.

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

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

Good boy Giorno no like drug

Dio’s father abuses alcohol and takes it out on Dio.

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

in part 2, Joseph gets his right arm cut off, in part 4, Okuyasu gets his right arm cut off, the main villain also carries amputated hands with him, in part 5 there are multiple amputations that happen.

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.

And Polnareff for like 8 seconds

Hand man go bye bye

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.

No epilepsy here ...Yet.

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

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.

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.

Teenagers die in parts 3, 4, and 5.

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

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

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

melone's behavior and stand is heavily implied stalking

Yes, at least two.

Some characters are mind-controlled by DIO

If you can't see it, you can hear it 100%. The SFX in jojo is phenominal, sometimes not in a good way.

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

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.

In part 6, a person is killed through an electric chair (the dragon guy, good riddance), the same person had attempted murder through electric chair.

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.

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

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

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

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.

Part 3 Episode 26

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.

The color schemes regularly change during intense scenes, so yes

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

In part 5 a woman gives birth in prison.

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

eposode 7 of stardust crusaders has a young girl nearly get sexually assaulted in the shower by an orangutan.

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

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

I think there is, as in part 5 narancia is called a girl at least twice.

Everyone in part 5 is gay so

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.

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

In part 5, the main character remarks on a prisoners abnornally tall and large, fat body wondering how he even got into the prison cell in the first place.

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

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.

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.

Yoshikage Kira is run over by an ambulance and many more

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.

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.

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

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

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

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

4 times

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.

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