It is very hard to find caring, competent groomers sometimes. You sound like the kind of groomer I would want for Sawyer. I also have never heard of such a thing. Sometimes a vet is not as familiar with a certain breed as we would wish. This sounds like maybe the vet was just trying to guess without really knowing the answer. Also, if a vet told me a groomer was the reason behind damage to my yorkie, especially as serious sounding as breaking ear cartledge, I would be at her place of business the same day! If she was bringing in her yorkie to be groomed again, she knows it is not your fault.