I'm sorry that the groomer shaved your baby and didn't follow your directions. Be sure to hug and love him and tell him he is adorable so that he doesn't confuse your anger and frustration with the groomer as being upset with him.
He probably feels different -- my guy acts like I stole his mojo when I simply trim his ears (he has a full coat). Maximo also gets self conscious when I start staring to check whether I got things even.
Make sure you show your baby smiles, not grimaces.