Ears Held Back
The eyes may be the mirror to the soul, and careful observations of both the mouth and the tail can yield all sorts of information about a dog’s intentions and emotional state, but the ears are a different matter altogether. The ears are more challenging to read and understand, and they usually have to be viewed in conjunction with other visual signals to make a useful interpretation. That is especially true when the ears are pulled back or held close to the head.
Ears that are tucked close to the head often indicate negative emotions. One possibility is sadness, which often results in ears that are tucked down close to the sides of the head. Dogs may show this when a favorite person departs. I once saw a dog pull his ears back like this when he saw some of his dog buddies playing but he couldn’t join them because he was on a stay.