Wait, no, you can't just say "everyone wears animal ears on this street" and not give me an in-world reason! Why? Is there a store that gives discounts to animal-eared patrons? Is it religious in nature, is their god some sort of animal superbeing who only gives blessings to the faithful (those with animal ears) and whose shrine happens to be on that street? Did a well-known and faithful dog who waited for its dead owner every day die on that street, and now people wear animal ears there to commemorate it?
I'm sorry Mr. Caidel, you can't just shrug and give no further explanation, and frankly Ellen you should be asking this too. I want to know, no, I must know, why everyone wears animal ears on that street.