I have some early memories from when I could barely talk. Back then, the world was composed almost entirely of emotions. They completely dominated the scene. Not only that, but my brain was smaller and less physically developed, so I had reduced capacities as well.

I think animals are exactly the same. Of course, animals' brains never develop past that stage ruled by emotion.

As a result of this, I believe anyone can do a thought experiment to see the world as an animal sees it: just think of very early memories from right when you first learned to talk. That is what being an animal is like.