It is true that dogs tilt their heads because they are trying to figure out what is going on with what they are watching. As a pet photographer it lots of fun to take this type of portrait.
I am often able to instigate this to happen by the specific sounds and noises I create that will then cause a sequence of head tilts. Often times the head tilts are too severe and don’t look the best. However, when the tilts are less severe, like this one of Wynnie–as I have seen it over and over again, they tend to be irresistible to the loving dog parents.
We all know how smart and observant dogs are and this is one of the ways they try to understand what is actually happening.