I had a discussion with Maggie about cover art not too long ago, and she made the interesting observation that cover design – not just the art, but the font choice and layout – tend to signal genres. Setting aside furry for a moment, you’ll notice that romance books nearly always have depictions of the characters (nearly always gazing into one another’s eyes). Fantasy books often have a scene from the story. Science fiction books tend to have scenes that suggest the story; if the story involves spaceships, it’s going to have a picture of a spaceship or a planet or such. And in terms of typography, science fiction books tend to use bold sans serif typefaces, but fantasy books often tend to use classic serifed fonts (look at the covers for books in the A Song of Ice and Fire series, or any of the many editions of The Lord of the Rings). Romance covers tend to go for either serif fonts, like fantasy books, or more cursive fonts. “Literary” novels get to play around with these conventions a lot more, especially in the modern era where the typography itself is likely to be the star of the show. (The genre publisher Tor tends to do its genre covers in ways that bring in that literary focus on typography, but that’s still unusual.)
While you can always break these conventions and go for a blaze of originality, in practice, genre readers tend to look for covers that look like their genre – even if they don’t know they’re consciously doing it. If you have a high fantasy book whose cover makes it look like a lost Arthur C. Clarke novel, you probably have a marketing issue.
So back to furries. We like to see, well, furries! A depiction of a scene from the story is a major signal to the audience: both “this is a book in such-and-such a genre” and “this is a book that involves a story about the furries on the cover.” Honestly, I don’t think abstract art for a novel or anthology that you plan to sell primarily to furries is a good idea; if it’s on a table at a convention and it doesn’t have a furry on the cover, people may be less likely to pick it up when they’re browsing.