https://www.iflscience.com/how-come-wild-animals-dont-have-floppy-ears-the-clue-is-in-your-dog-81818
Turns out, they were probably a side effect.
wild animalsfloppy earsiflscience
https://danbooru.donmai.us/wiki_pages/floppy_ears?z=2
Long animal ears that hang limp against the head, unable to perk up on their own. The ears must be completely limp, or almost completely limp, unless they ar...
floppy earswikidanbooru
https://www.fetish-pets-store.com/en/for-dogs/muzzles-snouts/leather-faux-leather-3/leather-dog-hood-with-floppy-ears-and-muzzle
Leather Dog Hood with Floppy Ears and Muzzle: Leather dog mask with removable muzzle, made of sturdy yet supple leather which promises a long life. The ...
floppy earsleatherdoghoodmuzzle