Actually, the only thing I've ever found in the eye of the beholder is vitreous.
Again, I am frustrated by my inability to convey my thoughts. I'll try again.
From reading Slop we cannot deny that there are many, many species that intermingle in the shown communities. They share a common language, they have a common history, interact within a common culture, have common tastes and desires, and the world is replete with these things in items and ideas displayed in the comic. That means there are common shared values. You can grab any one person out of that community and he could tell you those values without giving it much thought, he may not agree with them, but he knows them because he is a part of that community. The majority views (not to be confused with the majority's views) seep through a culture and affect those values accordingly.
Getting back to the point, Slop does seem to have a norm for beauty. Tony said it best when he was . Vepr's seem to be considered the least pretty, or at least Tony believes so. Just about every porno title had some canine in it... or were those categories? It seems that canids, and those who are similar to canids, are the most closely associated with "pretty." I guess that means you're in, Scotch.
But then again it might just be Tony's focus on the world, and his narrative colors the world and his desires for canids distorts our perceptions.
I hope I'm clearer this time around. If not, I'm just givin' up.