I would be sooooo mad!!! Well, the only thing I can add is that if he seems depressed it's not because he thinks he is ugly or has bad hair or anything like that-it's because he's picking up on your emotions. Try to see the bright side of it-now you have a clean slate to brush every single day (even though there is hardly anything to brush) and keep every single matt out for life
It will grow back
Go out and buy him some cute outfits to distract from the fact that he is "naked"