That groomer clearly didn't know how to cut a yorkie. Thank goodness it will come back.....I haven't taken mine in in years I just do it myself. Too many groomer not able to follow directions.
I will never forget the time a groomer cut my Jack's (RIP baby) hair on the
inside of his back legs. I didn't notice it until I got home, I put him down and watched as he walked away from me. The look on my face was

There was nothing back there! He was walking like he just got off a horse, all bowlegged and stiff looking. I think he could feel the breeze back there going through his legs! That was the last straw....