Fun Dog Fact of the Day: Pugs, due to the selective breeding that gives them their iconic appearance, have breathing problems stemming from their scrunched-up snout and eye infections stemming from their lack of brow ridges. As an example, here’s a pug from 2003 compared to the same breed in the 19th century.
More recently, some breeders have focused on breeding “retro pugs”, which try to restore their non-wrinkly appearance.