God no, animals should only practice sexuality with their own animal partners.
what punishment do you advocate for animals who have sex with other species of animal?
Does that even happen? If so, we obviously shouldn't punish animals, we should let them be independent. If animals have sex with other animals, that's wrong (INHO), but we shouldn't do anything about it. I just think that shouldn't happen, but I suppose it could lead to a first birth of another animal, so it could be positive I guess.
But
we are also animals, and why would we have sex with a pig or a dog? Its not only weird, but I'm not sure it would even work in many cases. I believe its unheard of for different animals to have sex with humans, but for people forcing or having sex with other animals should be punished for disturbing their peace or life. We are a very intelligent species, and we should control our own actions, I don't think other animals should have that responsibility. That's basically the difference.