5. Lifting and wiggling eyebrows
I think we can read a dog by its tail, but their facial expressions are much more telling.

In a recent study in Japan, dogs had their reactions to four different items recorded. When a dog saw his parent, the left eyebrow would raise, and when seeing a stranger there was less facial movement; the right eyebrow moved slightly. In addition, when the dog saw a toy he liked, there was a lot of movement in the eyebrows, and when they saw an item they didn’t like, their eyebrows weren’t very active.
https://viralifes.com/10-surprising-and-secret-ways-your-dog-says-i-love-you/6/