Why do people use help dogs?

I guess a lot of it depends on each individual's definition of help dog. My gyp will wind or run a track if the hog is within about 100 yd. If it's not that close she comes back to me. I've seen her jump a hog out of a pool, chase it into the woods and give up on it within a couple of minutes. If there is a bay she will go to it and bay like crazy and catch anything small. She just doesn't hunt and doesn't really run a track. If it's bayed she will "help". If it's already bayed then the other dog or dogs don't need help, just a cd. Like I said, not looking to start trouble or rag on anyones dogs, just curious. I'm new to all this, so I'm just forming opinions, which is why I asked the question.