Full Idea
Dog seems very handsome to dog, and ox to ox, and donkey very handsome to donkey, and even pig to pig.
Gist of Idea
A dog seems handsome to another a dog, and even a pig to another pig
Source
Epicharmus (comedies (frags) [c.470 BCE], B05), quoted by (who?) - where?
Book Reference
'Ancilla to the Pre-Socratic Philosophers', ed/tr. Freeman,Kathleen [Harvard 1957], p.36