If you have a short-haired dog, this is kind of a non-question; but for those of us with a long silky-haired dog, then it is an important thing. Those dogs, Poodles, Schnauzers, Shih Tzu's , and many of the other long-haired dogs need constant bathing and grooming of some sort.
I usually do my own bathing and grooming, and just trim the coat shorter in the summer, but sometimes, I have taken a dog to the groomers to have them bathed and clipped.
One memorable one was a shaggy, unkempt Poodle that the owner could no longer keep, and she was matted from the base to the tops of her hair. It was a case where only clipping everything off and letting the coat re-grow was about the only option.
Once she was bathed and groomed, she looked like a totally different dog, and was an exceptionally beautiful little Poodle !