Bulls are not, in general, animals with stellar reputations. Real-life bulls are territorial, protective of their herds and often easily provoked, and tend to react to perceived threats, rivals and irritations by means of a headlong charge to gore or trample the target of their frustration. This has resulted in fictional depictions of bulls almost always portraying them as violent, bad-tempered creatures that will gore or trample hapless targets at any provocation. They are also not likely to be terribly bright, even in worlds of Funny Animals and Intellectual Animals. The result is a standard portrayal of fictional bulls as dim-witted brutes with anger issues, easily riled but easily outwitted. Bulls are also one of the most likely types of herbivores to be portrayed as villains, in contrast to the usual depictions of carnivores and herbivores in media.
Note that this only usually applies to male cattle. Cows tend to be portrayed as much more friendly, easygoing and calm than their male counterparts, even though real cows can be just as aggressive and dangerous as bulls if provoked.
Oftentimes, especially in cartoons and/or when in the context of bullfighting, these bulls will be depicted with solid black coats. These bulls will also usually sport large horns, and their victims will be subjects to Horn Attacks.
Since Tropes Are Flexible, other bovines such as buffalo, bison, yaks or fictional bull-like animals can also fill this role, as can brutish and aggressive characters or factions for whom the bull is a prominent Animal Motif.
See Bull Seeing Red for a common provocation of a bull's bad temper. Compare Rhino Rampage and Full-Boar Action for similar portrayals of violent fictional ungulates. Contrast Everything's Better with Cows. Not to be confused with A Load of Bull, which is about minotaurs and other anthropomorphic bovines, although minotaurs are rarely pleasant fellows either.
- In One Piece's Dressrosa arc, during the Corrida Colosseum tournament, one of the "participants" is a bull called "The Brutal Bull" who plows through the gladiators by the dozens. Not long after, however, Luffy (the protagonist) manages to tame it and then ride on it to smash more gladiators.
- Magic: The Gathering: Many ox creatures are printed with the ability "haste", which causes them to attack the moment they're put into play rather than waiting a turn like most creatures do. Even those that don't tend to have references to fictional bulls' typical bad tempers in their flavor text:
The good news is it's vegetarian. The bad news is it just doesn't like you. — flavor text for "Ironhoof Ox"
- In the Italian Funny Animals comic Lupo Alberto (Alberto the Wolf), Krug the bull is far and away the most feared animal on the Mackenzie farm. He's not particularly bright — he barely ever speaks, his vocal repertoire being largely limited to grunts — but he's massive, extremely strong and has a notoriously foul temper. It says a lot that even Moses, the farm's shotgun-wielding Angry Guard Dog, is absolutely terrified of him. His presence is one of the few things that can habitually quell the fights between Moses and Alberto, as the two canids' fear of getting on his bad side easily outweighs their usual animosity.
- My Little Pony: Friendship is Magic (IDW): In "The Good, the Bad, and the Ponies", the town of Canter Creek is menaced by a band of literal cattle rustlers, a band of bandit bulls led by the villainous and foul-tempered Chief Longhorn, who are attempting to take control of the town through ruthless attacks and fear tactics.
- Ferdinand: The other bulls in the story are being trained to be bull fighters and tend to be violent and aggressive. Ferdinand himself is a pacifist who would only like to keep smelling the flowers. The main bovine antagonist, Valiente, is a much better fit — he's aggressive and short-tempered, and lives for battle.
- Zootopia: While Chief Bogo, the cape buffalo Chief of Police, isn't particularly evil by any metric, he's blunt, short-tempered, abrasive and cynical, very tough on his subordinates, and serves as an antagonist for the first part of Judy Hopp's character arc. This fits the theme of enforced Animal Stereotypes in the world of Zootopia, where people are expected to act according to the stereotypes associated with their species: the police force, for instance, is heavily dominated by animals expected to be tough and aggressive, meaning big predators and large, aggressive herbivores like elephants, rhinos and buffalo such as Bogo.
- Feet of Clay has Rogers the bull, a bull with bad binocular vision who believes himself to be two separate bulls with one eye each (hence Rogers). He's not perpetually angry but he is prone to charging things.
- Humorously inverted in The Story of Ferdinand and the subsequent animated and CGI adaptations. The titular bull, while massive and strong, is peaceful and easygoing. The humor of the story derives from the deliberate and extreme subversion of this trope, particularly in-universe where people expect the big and strong Ferdinand to be as aggressive as the other bulls and keep trying, and failing, to make him fight in the bullfighting arena.
- The Epic of Gilgamesh: After being spurned by Gilgamesh, Innana sends the Bull of Heaven to drain the Euphrates dry, requiring both Gilgamesh and Enkidu to defeat it.
- Dungeons & Dragons: Gorgons, despite the name, are a species of armor-plated bulls that breathe out a gas that petrifies those who come into contact with it. They're extremely bad-tempered, attacking other creatures on sight and attempting to gore, trample or petrify them, and are noted to utterly impossible to tame or domesticate.
- Leonhalt Domador of Aggressors of Dark Kombat is a Garbage Wrestler, Mighty Glacier and one of the brutish fighters of this game. He also has a prominent bull motif, being called "The Black Bull", with a skull of a bull on his jacket, and his stage is in a desert with skeletons of bulls in the background.
- Tauros, the archetypal bull Pokémon, is regularly described in its Pokédex entries as violent, short-tempered and very fond of charging things down. A Tauros with no enemy to charge will take out its frustration by ramming and uprooting large trees until it calms down. This is subverted with those native to Alola, which are stated to be somewhat calmer and more even-tempered than those found elsewhere in the world.
- Bouffalant, a buffalo-like Pokémon that serves as Tauros' counterpart species in Unova, is likewise described as prone to charging and headbutting anything it sees. It can apparently charge with enough force to derail a train.
- Averted in Poseidon: Master of Atlantis, where bulls serve to defend cattle from predators but don't act aggressively towards humans.
- Avatar: The Last Airbender inverts this with flying bison, which served as Bond Creatures to the Air Nomads and are friendly and cuddly unless you threaten someone they care about or otherwise push them too far. Aang's bison companion Appa functions as a Team Pet along with the flying lemur Momo (another creature traditionally associated with the Air Nomads).
- Bully for Bugs: Toro the huge black bull takes downright sadistic pleasure in fighting and charging his opponents, even using a grindstone to keep his horns extra-sharp. While doing this with the toreador he faces at the beginning of the short is potentially understandable, his launching Bugs into the stratosphere after a slap on the nose is definitely a case of Disproportionate Retribution. Throughout the short, Toro (mostly) relies on straightforward attacks and powerful charges, and while against expectations he shows a couple moments of cleverness, in the end he is of course outwitted and defeated by Bugs.
- My Little Pony: Friendship is Magic: The yaks are uniformly portrayed as stubborn, arrogant and not particularly bright. They all talk in Hulk Speak, without conjugating verbs or using pronouns or proper nouns (they refer to themselves and everyone else by using the person's species instead), and fly into rages whenever their ridiculously high standards for everything aren't met, violently smashing and trampling whatever objects failed to live up to their expectations.