I mean, seriously now, PETA wants to kill your dog? Surely you got something to back that up.
According to them, my dog is a slave. Come now, you know that. All domesticated and semi-domesticated animals are slaves according to PETA, that's why this thread exists. Freeing them is also why this thread exists, so maybe you should go back and read the OP again a few times.
Freeing them means they can come and go as they please at the very least (and here in San Diego that will kill pretty much every dog and cat in the county, or the coyote population will die instead, pick one).
It's really quite simple. I have a Sheltie (he's new, I don't think I've mentioned him before), a working dog. He doesn't have the instincts to survive in the wild because he's evolved to perform a few very specific tasks. He wouldn't last very long if "freed". The majority of small dog breeds would die very quickly in the wild. Then most of the herding dogs like my Max, because their aggressive instincts have been tamped down on. Most of the work dogs, like the Grand Pyrenees and Saint Bernard, would go with them. We're left with some of the larger terriers and poodles that still have hunting instincts, some of the more aggressive working breeds like German Shepards, some of the more aggressive general breeds like Akitas and bulldogs competing with the coyotes and wolves for habitat and role.
As for PETA supporting animal shelters, you are under the delusion that PETA is a unified front; as with all large movements, this is untrue. Local branches might do so. The national leadership does not.