I was thinking about this after looking at the cute Willow puppy pics.
What makes your own dogs tilt their heads from side to side? And do you do and say the things that will make them do this, just because it is so cute to watch?
If I make any kind of odd noise Jaspar and Leo tilt their heads. Or sometimes if I sing. (I am sure it is not a comment on the quality of my singing). Or if I say 'treats!' Or a word that they don't know, if it is a single word and they think that maybe it is a command they are supposed to know. Leo does it more than Jaspar. I don't know if I've ever seen Lily tilt her head!