I know this is very subjective but I think you can generally say that most humans prefer the smell of most plants and their raw products to the smell of most animals and their raw products (I am not talking about fried meat), including other humans and even themselves.

At least, there hardly is a stink coming from a plant that compares with human or dogs' excrements, and I also can't think of a smell coming from animals that would be as pleasant as lilac, mint, whole uncut apples, trees "waking up" in early spring...

Even if there are, they are not so common.

Why is this? Do we instinctively like plants more because they give us the oxygen we need and don't compete with us about it?