In addition to the parts already described, there is a flashback in S5Ep06 where a character remembers their childhood dog being killed by a larger dog (and flashes of the scene are shown)
Throughout season 1, Allison's family is constantly gaslighting her to try and hide their activities. In the first ep of season 2, Isaac's father physically abuses him and then argues that his actions were Isaac's own fault. Other characters lie/gaslight throughout the show to keep family/friends/etc in the dark about supernatural happenings.
Stiles' dad is the sheriff. He's repeatedly shown to be a 'Good Cop' and depicted very positively. Stiles admires his dad fiercely and often helps him with cases.
In season 2,episode 9, a character commits suicide rather than become a werewolf. Her husband helps her do this.
Season 3, episode 6 focuses heavily on suicide. The characters are staying at a motel with notoriously high suicide rates. Four of the main characters are shown having suicidal thoughts/actions. Other suicides are shown or discussed, including off screen audio of a couple committing suicide together.
Characters are drugged at several points throughout the series with wolfsbane. This is shown to be deadly or lead to suicidal thoughts and actions for the werewolves, and causes human characters to act drugged and lose their inhibitions. At one point in season 2, Lydia (who's actions are being controlled by someone else) poisons a whole party of teenagers by spiking the punch with wolfsbane. At another point in season 2, several characters try to drug someone by needle injection at a rave. Other characters in season 2 are forced or tricked into to taking Kanima poison, which can cause them temporary paralysis/convulsions.
Various people stalk/are stalked at various points in the series, including but not limited to:
In season 1 and beyond, Derek often watches Scott and others from a distance somewhat menacingly. He corners Scott and Jackson at various times, often when they are alone in a lockerroom or bathroom. Sometimes this is paired with violent intentions or actions.
Throughout season 2, a teen boy is shown to be stalking Allison, including taking invasive photos of her, trying to pressure her to date him, being explosively angery when she rejects him, and later threatening to kill her.
Isaac's father is extremely physically abusive, including throwing objects and locking him in a freezer. Even after the father dies, this fact is occasionally brought up, including vivid flashbacks which cause Isaac to become briefly suicidal. At one point Derek throws an object at Isaac in a deliberately similar way.
Isaac's father is extremely physically abusive, including throwing objects and locking him in a freezer. Even after the father dies, this fact is occasionally brought up, including vivid flashbacks which cause Isaac to become briefly suicidal. At one point Derek throws an object at Isaac in a deliberately similar way.
Mountain Lion is killed, Last breaths shown on screen, very, very unrealistic. Just skip after everyone starts walking towards something that was shot in the parking lot, at the very end of episode 6 if you need to
there's no dogfighting exactly, but the main characters are werewolves and fight a lot...also some of them have the ability to shift so they look more like actual animals, but they're not technically dogs?
There's an episode (season 2 ep 12 I think) where snakes are used for horror effect. Description below:
Jackson is handling a live snake- it slithers into his mouth and he swallows it. Later the snake slithers back out of his eye socket.
In season 2, Matt has flashbacks to nearly drowning as a child, and is killed by drowning by being held underwater in a shallow stream.
Boyd has flashbacks in season 3 to a girl (sister?) he knew drowning to death.
A family of werewolves, including children, was burned alive in their home. The event is repeatedly referred to and shown in flashback. At one point in season 3, Scott almost burns himself and Stiles alive with gasoline and a flare when he is briefly suicidal due to being drugged.
In season 2, Erica has seizures, including one where she falls off a climbing wall and is embarrassed in front of her classmates. She refers to having been bullied about her epilepsy, including classmates who uploaded a video online of one of her seizures.
Allison’s mother, Victoria, dies, though I’m unsure if it’s onscreen or not. Stiles’ mother, Claudia, is dead before the series begins, though her and her death is talked about throughout the show. Isaac’s father is killed during the start of Season 2.
Many scenes take place in the locker room where teen boys are showering. After a traumatic incident, Lydia is shown showering and having horrible visions.
Okay here goes, I'm going to try and be as specific as possible:
In s01e04 Derek is seen throwing up some sort of black fluid, starts at 33:18 and ends at 33:26, it is seen and heard.
In s03e07 Danny is rushed into a hospital by Ethan, he is then sat down and briefly examined by Melissa and throws up very suddenly. Once again seen and heard, starts at 02:26 and ends at 02:37.
In s03e22 there is a scene directly at the start of the episode where Deaton is pulling something out of the mouths of Ethan and Isaac, and it's safe to assume he did the same to Aiden before, while there's no actual vomit, there's a lot of gagging/coughing from the two of them, and the shots of black in the water hints that one or more of them brought something up. Seen and heard, starts at 00:48 and ends at around 01:38.
It's important to note that this is based on the Netflix upload only, I can't be certain it won't vary on other platforms. I haven't seen past the end of s3 yet, I'll add any more I see.
In season 2,ep 8, characters use a needle and syringe to poison people at a rave. In season 3,ep5,Alison is a needle and thread to stitch up a wound Scott has.
Scott's mom is a nurse and there are many scenes taking place in the hospital, including one's where characters are injured, recovering, dying, or dead.