Sorry - but I don't agree with domesticating animals that are better left in their natural habitat. It's bad enough all the animals we've domesticated so far, in my opinion. I'm sure they'd much rather run free, for however short a time they may live, rather than being stuck in a cage all their lives. I should think them chewing through every single cage they're presented with is a big, clear, neon sign that "Hey! Maybe this is WRONG!"
If they're considered a pest, that's our species' problem. Just like house mice are considered pests, just like city rats are considered pests. Good lord forbid if any creature tries to inhabit our houses or our yard and do their wild nature thang, because that's invading OUR territory! *le gasp* Can't have that. Oh no, no, no.
So we've stripped the freedom from animals, and if we try and do the right thing, by returning them to the wild, in my opinion, then that apparently screws up our entire ecosystem. Sorry - but I don't believe it. Nature works in mysterious ways - with, or without us, she will right herself, and all of her creatures to co-exist as they once did, and as they're supposed to.
It's pretty sad when the only solution to solve "territorial" behaviors, is to strip an animal of its reproductive organs. If that's the ONLY solution there is to calm down a "fiesty and territorial" animal, then perhaps it's not worth it to have that animal domesticated.
Sure - pets are "happy" to be in your home. But that happiness, in my opinion, is akin to how "happy" we are to be inside our homes, 24/7. Just as we need to get out every now and again and stretch our legs, and smell the air, so do they - they need to stretch their legs, and scurry through the grass, and feel the sun on their fur.
But apparently, you won't understand that. And I understand that; most don't.
My opinion, of course. *shrugs* Unfortunately, nothing can be done to give animals back the freedom we've taken from them.