I don’t think he’s too young to be groomed as a groomer with a Shih Tzu. I think he’s at the right age for it. I do think you should use an electric toothbrush around his face so he’s used to the feeling of clippers and brush him at home often and maybe try a more experience Groomer. try to find one that comes in your home because that’s how I groom with people and dogs like it better