My dog is nine years old and people still think that he is a puppy. They tell me all the time that he looks like such a happy dog and he does. He has the perfect , stress free life, here in the middle of fifteen gated acres. The biggest thing that he has to contend with are a few deer and an occasional coyote.
Yup, people who are unwilling to do what it takes to keep a dog happy probably shouldn't have one anyway.
Give it positive attention, don't hit it, keep it fed, give it a place to get warm and dry. Those things will make a generally happy dog. I never trained mine to do anything but he doesn't crap in the house and he comes when I call. (He sticks to me like glue anyway)