| Your founding assumptions are simply untrue. What you perceive as "pretty much…alike" are just as disparate as adult human voices. You're simply not trained (or physically able) to distinguish. This is the same reason native Germanic language speakers can't always distinguish between "v" and "w," or why you can't pronounce half of the Danish vowels (or tell the difference between them, really).
Anyway, dogs yelp similarly just as people scream similarly. That doesn't mean they don't have different voices. |