I'm jealous of my dog's infertility.
Why are you jealous of your dog?
I want to be like them for once. They get to have sex with whoever they want without consequences.
It's not good to be jealous of your dog, especially because you want to be able to have sex with whoever you want. Being jealous of people or animals will just lead you to feel frustrated in life. If you actually want to avoid having children, there are medical procedures you can have done.
I wish I could sleep around without any consequences.
There is nothing to be jealous of when considering being an animal just for sexual pleasure. Animals are operating at their own level, but that is not correct for a human. Embrace your being a human being instead.