[h2odragon]

> In the future, we have talked about analysing a pet’s body in addition to its face in order to improve the accuracy.

I think that's vital. Most of "Dog language" and even more of "Cat language" consists of body language. Things like pose and tension in relation to the rest of the things in the area at the moment. Dogs and cats are gifted with the ability to "speak human" enough to be understood tolerably well, but their language is demonstrably more complicated.

[hnick]

And many emotional displays are transient, like stress induced yawns in dogs (I note stress isn't in their top 5 list but it's common during training and learning new things).