I KNEW IT!
"Andics and colleagues also noted that praise activated dogs' reward center – the brain region which responds to all sorts of pleasurable stimuli, like food, sex, being petted, or even nice music in humans. Importantly, the reward center was active only when dogs heard praise words in praising intonation. "It shows that for dogs, a nice praise can very well work as a reward, but it works best if both words and intonation match. So dogs not only tell apart what we say and how we say it, but they can also combine the two, for a correct interpretation of what those words really meant. Again, this is very similar to what human brains do," Andics said."
http://www.eurekalert.org/pub_releases/2016-08/elu-dbp083016.php
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