A new study from Hungary proves what you've always suspected: there's a good chance that your dog understands at least some of what you're saying to him. The study showed that, just like humans do, dogs appear to process the meaning of words using the left hemisphere of their brain, and process the tone using the right hemisphere.

According to Dr. Attila Andics, 13 dogs were taught to lie still in an MRI scanner while listening to recordings of their owners' voices. Dogs heard praise words, in both a positive intonation and a neutral intonation, as well as "neutral conjunction words" in both intonations.