Many people acknowledge that nonhuman animals do have interests, but it is a commonly held opinion that their interests do not count for much. It is important to refute this myth. Equal interests should count equally.

Eastern Gray Squirrel
The term “interest” is used to describe what is beneficial for
someone. That is, in other words, what promotes what is good for
anyone whose life can go well or ill. We say “that’s in the interest
of someone” when something is positive for someone. When we think
about how to act, as we do when we engage in moral thinking, we
consider the interests of others that we should respect.
Do nonhuman animals have interests? As our text on animal sentience
shows, they clearly do. They can feel suffering and joy. Their lives
can go well or ill for them. This means they do have interests, just
as humans do.
Traditionally, the interests of nonhuman animals have been largely
disregarded. Nonhuman animals have only been granted minimal moral
consideration. As a result, they have been systematically exploited
in many ways that cause them to suffer. They have also been killed
in great numbers to provide humans with commodities made from their
bodies.
In addition, the vulnerability of animals to many things that are
not caused by humans has usually been disregarded as if it were
nothing that we should worry about. So, the idea that we should
refrain from harming nonhuman animals or that we should try to act
in a way that benefits them has barely been given any consideration,
with just a few exceptions.
However, in present times, that viewpoint has been strongly
challenged. Since the 1970s, the field of animal ethics has arisen
and achieved growing support as a field of research that actively
informs the defense of nonhuman animals.
Interest in not suffering
Sentient beings have an interest in having a happy existence. The
first thing this implies is being happy rather than miserable.
Suffering is by definition a negative mental state, and it’s
therefore harmful for animals.
Interest in living
In addition to having an interest in not suffering, animals need to
be able to live in order to have a happy life. Many people think
humans, but not nonhuman animals, have an interest in living. There
are strong reasons to refute this.
The weight of animals’ interests
Many people acknowledge that nonhuman animals do have interests, but
it is a commonly held opinion that their interests do not count for
much. It is important to refute this myth. Equal interests should
count equally.