I can't stand the anti-trans argument, "Well, then, if I want be a dog, I can become a dog!"
I want to argue back, "OK. First you'll need to tell your friends and family that you plan to live the rest of your life as dog. Then, you'll need to start medication that will make you more like a dog. You will need to prove to at least 2 medical professionals you've truly felt you were a dog for at least 6 months. Next you'll probably need hair transplants because dogs have lots hair. You'll need surgeries to add a tail, reconfigure your legs, and adjust your vocal cords (dogs don't talk!). If you do all that, then sure you can be a dog."
Oh, BTW, don't most dogs get neutered? hehehe