Just as we reject racism sexism ageism and heterosexism we reject speciesism. The species of a sentient being is no more reason to deny the protection of this basic right than race sex age or sexual orientation is a reason to deny membership in the human moral community to other humans.
The response of anybody interested in liberty is that we all have a say and the ability to have an argument is exactly what liberty is even though it may never be resolved. In any authoritarian society the possessor of power dictates and if you try and step outside he will come after you.