We cannot really just free dogs. Most dogs would not know how to live outside and some don't even have the conditions to due to selective breeding.

Besides dogs usually like their humans if they are given a good life and can even search for them when they die. They are tamed animals, we've evolved toguether for a long time, both species enjoy interacting.

You could just let your dog outside and let it come back I guess but they would still have a lower life expectancy because diseases, cars, the world isn't really built for them. same for other pets except like fish because people don't have the resources nor know how to take care of them usually.

Also, the thinfs that go on their body and that like the front of it, is better than collars. You can just use none if you know the dog isn't gonna run into a car tho.

If you threat them well they should have a better life quality.