I have not seen a lot of that around here - those that do it seem to think that we who live in the country always have room for "one more," whether it's a dog or a cat. Or, in some cases, a box of puppies or kittens. It was much worse in NM, semi-feral dogs roamed the rez quite a bit. And got hit on the highway, sadly. Here, shelters only accept animals from city residents. If you live in the county and have to deal with a stray animal, you're on your own. Which often does not bode well for the animal.