I am soo sorry. But it will grow back. It may take a few monthes, but it will. My ex groomer did that to my Luigi and he looked like a chiahua for about 2 monthes! After I got over being upset, I would look at him and just laugh and smile! Here is a pic of him of it will make you feel any better! She didn't cut Brasco quite as short, but he was really short too.
http://s5.photobucket.com/albums/y17...t=luigi334.jpg
But here they are after about 4 monthes of growing!
http://s5.photobucket.com/albums/y17...omigday004.jpg
So sorry you are upset, but trust me...it will grow back!!!!
And welcome to YT!!!!!!!