The dwarves in-game are known for being heavy drinkers. Your character can also get very drunk to the point of vomiting and being unable to see clearly, but this is only if you choose to do so.
There are a few quests that I can think of that features mobs being abused in one way or another, usually by hostile NPCs who are trying to forcefully tame them. All the quests I can think of feature you saving some of the mobs.
I can't recall any dogfighting happening in the game, personally. You, as a humanoid player, fight doglike mobs, but I can't think of any typical dogfighting happening.
Much of it is just mentioned rather than seen, but if you play an undead character, cannibalism is a racial ability, you can eat humanoid corpses to heal yourself.
In the retail version of WoW, there is a Horde quest called “Do The Right Thing” where many (living) humans are sticking out of the ground with only their heads showing. You can choose to squish their heads with the shovel or free them.
There are some NPCs, particularly orcs and trolls who have broken teeth, though the breaking is not shown on screen. Vol'jin breaks a tusk during the battle at the Broken Shore.
While their deaths are not seen or described on-screen, there are a few LGBT characters in the Shadowlands (the Afterlife) specifically a lesbian couple and a transmasc character, who have died at an earlier date likely off-screen. But the few canon LGBT characters have not yet been killed off
There is a dragon who is blind and, therefore, has ridiculously good hearing, as the trope goes. You use this against him during his boss fight. There are plenty of other characters who are treated as defective and imperfect, which can closely mirror ableist behavior.
While mostly being pretty cartoony and mild, there’s a decent amount of body horror, blood, and fantasy violence. It gets more intense in more recent expansions, in my opinion