He looks really cute, but that is no excise for what the groomer did.  I would find another groomer next time.  
 
So, what's done is done.  You might as well take advantage of it and brush him alot.  With that short hair, it won't pull and he just might start liking it.    

With his hair cut off and his mats all gone...
           Oh where, oh where can he be???
