I'm being forced to dissect a cat, or I fail. How is this fair?

I am in 12th grade Human Anatomy. My teacher is under the impression that we need to dissect a cat to learn more about the human body. She told us that the cats she got for our class were euthanized from a pound. I looked at the cats: their faces were twisted in horror. Their mouth's were wide open, tongue's erect, and their eyes reflected pure fear. These cats were electrocuted. When electrocuting animals, a clip is put on their lip and an anal probe is shoved inside of them. These two things emit a high electrical current that kills the cat. That's why they looked like they had suffered - because they did - they were not euthanized. Each cat cost $35. Our school purchased 22 cat cadavers; that's $770. The pound gets paid for killing these animals. That's why they are only held for four days. It's a money trap. These innocent animals were killed so that a few people can get rich off their dead bodies. And now what are we doing? We're dissecting them. The cats in the pound are people's pets. They were all strays. I'm being forced to dissect someones pet. If I don't do it then I can only get, at the max, a 45% in my Human Anatomy class. I am an all A student. This is morally against everything I stand for. I didn't know about this when I signed up for the class and I can't switch now because I am so close to graduation. I live in Michigan. By state law my teacher and the school is not required to provide an alternate assignment for me. If they decide that I fail because of my choice, then I fail. Please, just share with me your opinions.