Some dog like familiars exist and can be enemies in the coliseum. Battling in the coliseum is 100% optional, and it’s likely they’re not actually dead but rather “faint” like in Pokémon.
You can fight cats and cat-like creatures in the coliseum, though none of the food items they drop are or resemble cats, and i dont think its intended for you to think the familiars die when fought
Pornographic content, sexual violence, erotic literature, and erotic roleplay are not allowed on the site. Using dragon names and usernames to portray this kind of content is also not allowed.
Not in the base game but some players might name their dragons the r slur and use the r slur on their profile/in the forums/in comments. This is against the rules. (I think the word is blocked but it might not be)
There are currently no explicitly clown-themed apparel or familiars in the game (though there are jesters), but dragons can be clowns in terms of lore.
One character, Fiona, is canonically a trans woman, and she is always referred to with she/her pronouns. However, some posts by users in the forum function have the potential to be transphobic, so be cautious.
You can make dragons wear apparel, with many dress like clothing exists, and none of the apparel is gender locked. You can make a boy dragon wear a dress and he’ll likely look very good in it. Nobody is made fun of for this unless a player decides to.
There's prejudice against dragons and Beastclans in the site's official lore, and some people may have dragons who are discriminatory towards certain breeds/flights/etc, but that's about it. Real hate speech is banned on the site.
The Water Flight's special Coliseum ability is called Drown. The ability's tooltip states that the opponent is doused in a curtain of seawater. The animation for the ability only shows water appearing underneath the target.
However, there are no official depictions of drowning. Most, if not all depictions of this are in player-written lore for their own dragons.