Dog and Human brains have 'voice areas' in brain.

Interesting reading.

http://www.medicalnewstoday.com/articles/272995.php

Really interesting read!

That was interesting. You wouldn't think the reactions would be so similar, would you?

Yes but after reading that it actually makes sense.
Dogs have evolved so closely along humans. They almost have super powers noting our body language so why should their brains not also have evolved to understand us better. Humans blab all the time they have to make sense of the tone at least.