That was Sam. It isn't a person under our legal system because it hasn't been defined as such by the law. The SS#, tax dependency, car pool lane, whatever else are just examples of that status quo. Fetuses are not legally persons. Like I said, you can try to change that, maybe by offering the unique DNA as evidence, but unless/until you succeed in changing the law that's the way it is. Dogs are alive, present in the USA, and have unique DNA. They are not persons with legal rights. You can endeavor to change the law to make it so, but until then they're dogs.