Ha! Dog groomers, that’s pretty funny!
Out here in deeply rural Alabama, not only do most dogs not get groomed, many never had a bath in their life unless they were swimming in the creek or something.
In the sticks, lots of folks have dogs that they never let in the house, are chained to the dog house so they don’t run away, and are never taken to the vet. The attitude is, that’s my dog, but if he dies, I’ll just get another one.
Some folks, like trailhkr1 said, don’t even chained up their dogs, but just let them wander where they will. They might not really have “owners”, but just show up at the house where the humans that feed them live, in order to eat what they can’t catch.
Still, I don’t mind. I like living in the country, and any dog wandering in my property gets chased out by my dogs, me, or if they won’t shoo and cause problems, will get double-ought.
That attitude might work in rural Alabama, but it wouldn't work in south Texas. Back when my dad had a ranch, we had several Australian Heelers for working cattle and were allowed to roam freely around the compound. They were all vaccinated for rabies. The high incidence of rabies infection of mammals and especially coyotes in south Texas makes having unvaccinated dogs very dangerous. There is even a program to put out vaccination baits to lure wild coyotes. The program has been very successful at decreasing the incidence of rabies in coyote populations