From the Independent: "In a world-first experiment, academics in Hungary trained 13 dogs to voluntarily lie in an MRI scanner to monitor what happened in their brain when the researchers spoke to them.
They discovered that dogs’ brains process language in a similar way to humans, with the right side dealing with emotion and the left processing meaning.
It was only when both sides of the brain agreed they were hearing praise that the dog was truly happy."
From reddit user abernha3: "Little Andrew was my junior. He was 15 and a half and loved everyone, but just got old and sick over the last year. He purred everyday of his life and when he lost that, I knew it was time. Always sad to lose a friend." :(