There aren’t any content warnings for links on HN. So it’s not like the user is making a conscious choice to go to a furry personal blog.
Nothing wrong with it, but giving some sort of content warning isn't the worst thing in the world.
Personally, it does get annoying sometimes when two completely unrelated topics are fused into one - personally I'd find this kind of content equally as annoying as that cringe Gen X "Semiconductors with Brittany Spears" shtick, but to each their own.
There is nothing wrong with content flags or warnings, especially for stuff with a sensual or potentially sexual connotation.
No one owes you a content warning that "this site contains cartoons and that might annoy you."
In most cases, people do owe content warnings for content that is potentially sexual in nature.