Man's best friend actually knows what man is saying, according to a new study out of Hungary on how dogs react to language. By training 13 family dogs to sit still in an fMRI scanner, the authors of the study discovered that by saying positive words in an excited manner, two different regions of the dog's brain lit up — the left hemisphere, which is connected to the meaning of words, and the right hemisphere, which is connected to how words are emotionally said.