Vets: wonderful but not perfect

We take our three cats and dog to a local veternarian and have for all of their lives; before these four, we took three other cats. We have been satisfied with the services of the clinic but now are unhappy. A malady that afflicted our sheltie Comet was mis-diagnosed and he suffered a great deal because of it. We don't even know if he will recover although we are doing all we can to help him. Had the problem been diagnosed properly at the outset, he would be fine now. The moral is to get a second opinion if an illness does not seem to be responding to treatment. A second lesson is that those who choose medicine as a profession take on a great deal of responsibility. It's way, way more than lucre. Way more.