Groomers don't need licenses or need to take tests like hair stylist. All that my certificate states is that I went to a grooming school, trained to be a groomer & took the pet hygenist & certified groomer courses. Also pet cpr.
It will look nice framed on the wall of my future pet spa...but really when it comes down to it, it's how the dogs turn out...& word of mouth. Right now in the state of Ca, grooming scgools don't need to be regulated but do meet minimum state requirements.
Lorraine gave very good advise.